Trouble​shooting

Thermostat_Signature_front


Please click here to visit our nVent Thermal YouTube channel to access installation videos for our nVent Nuheat Signature, Home and Element thermostats.

The red light is on or blinking on the thermostat.
  • Cause
    Solution

  • The GFCI Test button has been pressed manually.
    When the GFCI Test Button has been pressed, the screen will display “GFCI Error – Ground fault detected” and the RED light will be activated. This is normal. Cancel the error message by pressing the Reset Button (on the lower right side of the thermostat) once.

    This message is supposed to appear each time you press this button as you are testing to ensure that the GFCI safety feature works, much like testing an alarm.

  • The Ground Fault Circuit Interrupter (GFCI) has been triggered.
    Determine the blinking pattern and then see the instructions Steps below. 

    Solid red light – press the on/off button to reset the GFCI.

    If the red light on your unit is located at the TOP or on the RIGHT side of the thermostat and the red light does not turn off, this indicates that there is a ground fault in the heating system. Contact your electrician or installer to verify the wiring and test the system with a digital multimeter. 

    Slow blink - Press the on/off button to reset the GFCI.

    Fast blink - This indicates that there is a ground fault in the heating system. Call your electrician or installer to verify the wiring and test the system with a digital multimeter.

  • The system has not been wired or grounded properly.
    The electrician needs to inspect the wiring of the thermostat and mats/cable. Have the electrician see steps below for instructions.

  • If the causes above do not solve the issue, please follow the instructions below.
    • Steps for Homeowner:
      1. At the thermostat location, press the reset button located on the bottom right side of the thermostat faceplate once to see if the error message and RED light will reset (click here to open the Operating Manual for reference).       
        1. If the error message and RED light disappear, set the thermostat to 'Heat' and allow the floor to heat up.
          1. If the floor heats and the error message and RED light do not reappear, continue to operate the system normally.
          2. If the thermostat trips the GFCI as soon as the heating indicators are displayed on the screen, please call your electrician and proceed to electrician troubleshooting (Step 2). 
        2. If the error message and RED light do not disappear, turn OFF the circuit breaker controlling the floor heating circuit. Leave the breaker OFF for 10 seconds, then turn the breaker back ON.
          1. If the thermostat resets and the floor heats up, continue to operate the system normally.
          2. If the thermostat displays the error message and RED light as soon as the power is turned back ON, contact an electrician and have them come to the site to perform steps 2 to 6. 

    • Steps for Electrician:


      A. Please read and follow the steps noted below.

      B. If the issues are not resolved, or if any assistance is required, we recommend that the electrician and homeowner call nVent NUHEAT Tech Support when the electrician is on site so that we can ensure all trouble shooting steps have been conducted properly and explain any next steps.  

      1. At the breaker panel, turn OFF the circuit breaker controlling the floor heating circuit.
        1. Confirm the supply breaker is a standard breaker (not GFCI)
          • If the breaker is a GFCI, replace with a standard breaker and attempt to heat the floor.
        2. Confirm if the supply breaker is a dedicated line, only connected to the floor heating system.
          • If the line is shared with other appliances, correct the wiring to comply with installation requirements (dedicated circuit). 
      2. At the thermostat location, remove the faceplate (there is a small screw at the bottom of the faceplate - loosen the screw but do not remove it) and remove the thermostat base from the wall. 

      3. Inspect the wiring at the back of the thermostat and in the junction box in the wall.

        • Ensure that there is no damage to the wires or thermostat.
        • Ensure that the system is grounded properly. The braided metallic shields of the mat/cable should be tied to the grounding screw or copper in the junction box.
        • Verify the wiring to the correct wiring diagram for the unit.
             
      4. Disconnect the mat/cable (load) wires connected to terminals 1 & 4 on the thermostat backplate. 

      5. Using a digital multimeter with a fully charged battery set to 200 Ohms, perform the Resistance and Insulation tests. Instructions for how to perform these tests can be found in the Mat Installation Guide here.


        Testing Notes

        Ensure all Insulation and Resistance testing is done at the factory cold lead location. If the mat or cable cold lead (load wire) has been terminated in a junction box (other than the thermostat location), you will need to access and test from the factory cold lead location.

        If there are multiple cold leads (load wires) from the floor, test each mat/cable cold lead separately and record your findings for each.

        For 240 V mats or cables that are 20 sq. ft. or smaller, you will need to set your digital multi-meter to 2K ohms

        1. If the Ohms reading for the Resistance test is outside the testing parameters (more than 10% above/ 5% below or showing an open line) then the heating element has been affected and will need to be inspected by a technician.

          1. Measure the voltage on the line side of the thermostat and ensure that it is the same voltage the load is rated for.

            • If the line voltage matches the load voltage, click here to fill out a Repair Request form. Please make note of the Ohms and Insulation tests readings, notes on troubleshooting steps taken. Please take a photograph of the mat/cable UL/CSA tag that is on the end of the lead wires.
            • If the line voltage measured is higher than the voltage rating for the load, the heating element is not repairable.
        2. If the Ohms reading for the Insulation test is outside the testing parameters (any Ohms reading other than an open line) then the heating element has been affected and will need to be inspected by a technician. 

          1. Measure the voltage on the line side of the thermostat and ensure that it is the same voltage the load is rated for.

            • If the line voltage matches the load voltage, click here to fill out the Repair Request form. Please make note of the Ohms and Insulation tests readings, notes on troubleshooting steps taken. Please take a photograph of the mat/cable UL/CSA tag that is on the end of the lead wires.
            • If the line voltage measured is higher than the voltage rating for the load, the heating element is not repairable.
      6. If the Insulation and Resistance tests pass inspection (Step 5), the next steps is to test the thermostats built-in GFCI. 

        1. At the breaker panel, turn OFF the circuit breaker controlling the floor heating circuit. 

          • Disconnect the mat/cable (load) wires connected to terminals 1 & 4 on the thermostat backplate.
          • Turn ON the circuit breaker controlling the floor heating circuit.
          • If it did not come on by itself, press & hold the ON/OFF button (located on the bottom right side of the thermostat faceplate) for 4 seconds.
          • Set the thermostat to 'Heat' the floor
        2. If the thermostat trips the GFCI with no load attached, then the thermostat's GFCI will need to be replaced. Please check the proof of purchase for the purchase date. For thermostats within the 3 year warranty period, click here to complete the Thermostat  Backplate Replacement Form. Proof of Purchase and a photo of the back of the faceplate of the unit is required for all warranty replacements. 

          For units past the warranty period, please purchase a new thermostat from an authorized dealer and have a certified electrician install it. There is a Where To Buy tool and Find An Installer on www.nuheat.com or contact customer care to help you locate a authorized dealer

        3. If the thermostat DOES NOT trip the GFCI

          • Reattach the mat/cable (load) wires to thermostat terminals 1 & 4 and set the thermostat to a 'Heat'.
          • If the thermostat trips the GFCI only when a load is attached then the issue is in the floor and a site visit from a repair technician is required. Click here to submit the Repair Request form. 

            Please make note of the Ohms and Insulation tests readings, notes on troubleshooting steps taken. Please take a photograph of the mat/cable UL/CSA tag that is on the end of the lead wires.

          • Please call nVent NUHEAT Tech Support to ensure that the troubleshooting steps have been conducted properly.

    For a downloadable PDF of these instructions, please click here.
The screen is blank
  • Cause
    Solution

  • The unit is turned off.
    Turn the unit on by pressing the on/off button on the right side of the thermostat. Wait several seconds for the screen to turn on.

  • There is no power going to thermostat.
    Press the GFCI test button at the top of the thermostat. If the red light at the top of the thermostat (or on the right side depending on the thermostat model) turns on, this indicates that there is power to the thermostat. If not, confirm that the circuit breaker on the electrical panel is ON and/or contact your electrician to confirm/check the wiring.

  • The thermostat is no longer functioning.
    If the unit was previously functioning properly and now the faceplate is blank and if there is power to the unit and attempts to turn the unit on has been unsuccessful, then the thermostat needs to be replaced. Please check your proof of purchase for purchase date. If your unit is within the 3 year warranty period, please contact nVent NUHEAT Customer Care at 1-800-778-WARM (9276). Proof of purchase is required.

    For units past the warranty period, please purchase a new thermostat from an authorized dealer and have a certified electrician install it. There is a Where to Buy tool and Find An Installer tool on https://www.nuheat.com/ or contact customer care to help you locate a authorized dealer.

  • Wiring on back of thermostat is reversed.
    For brand new installs, if the thermostat is blank, most likely the wiring for the line and load terminals have been switched. See Steps for the Electrician below.

  • If the causes above do not solve the issue, please follow the instructions below.
    • Steps for Homeowner
      1. At the breaker panel, confirm the circuit breaker controlling the floor heating circuit is ON.
        1. Cycle the breaker OFF. Hold the breaker OFF for 10 seconds and then turn the breaker back ON.
      2. At the thermostat, press & hold the ON/OFF button (located on the bottom right side of the thermostat faceplate) for 4 seconds, then release and wait 4 seconds to see if the screen display turns on.

      3. If the screen does not turn on, press the GFCI Test Button (located on the top of the thermostat) and check for a flashing RED light (located either on the top or right side of the thermostat). 

        1. If the thermostat screen remains blank and the RED light activated when the Test Button was pressed, then the thermostat needs to be replaced. Please check your proof of purchase for the purchase date. For thermostats within the 3 year warranty period, click here to complete the Thermostat Faceplate Replacement Form. Proof of purchase and a photo of the back of the faceplate of the unit is required for all warranty replacements. 
        2. If the RED light does not appear, contact an electrician and have them come to the site to perform steps 4 to 6 using a digital multimeter.


    • Steps for Electrician
      1. At the thermostat junction box location, confirm there is power (120 V / 208 V / 240 V) at the line side of the thermostat (terminals 2 & 3 on the thermostat back plate).
      2. Confirm the wiring is correct (click here for the quick start wiring guide).
        1. Incoming power to terminals 2 & 3
        2. Load wires connected to terminals 1 & 4
        3. Braided ground shield tied to the house ground
      3. If the voltage and wiring are correct and the screen is still blank, click here to complete the Thermostat Backplate Replacement Form. Proof of purchase and a photo of the back of the faceplate of the unit is required for all warranty replacements.

      4. For units past the warranty period, please purchase a new thermostat from an authorized dealer and have a certified electrician install it. There is a Where to Buy tool and Find An Installer tool on https://www.nuheat.com/ or contact customer care to help you locate a authorized dealer.

    For a downloadable PDF of these instructions, please click here.
Thermostat disconnects from my WiFi network unexpectedly.
  • Cause
    Solution

  • WiFi router set to mixed encryption
    Some WiFi routers are factory defaulted to a mixed encryption type meaning it is can be compatible with WPA as well as WPA2 encryption types. When the security setting on the WiFi router is set to mixed encryption (WPA/WPA2), certain routers are having issues staying connected to the SIGNATURE Thermostat. In your WiFi router’s security settings, change the encryption type to WPA2 Only (newer and more secure encryption type than WPA) and try reconnecting your SIGNATURE thermostat to your WiFi network. If using a dual-band router, make this change on the 2.4Ghz band which the SIGNATURE thermostat uses to connect to your WiFi router. 

  • Wireless interference is disrupting the WiFi connection
    The channel on your router is likely set on Auto. If you are experiencing intermittent connection issues while on Auto, try changing to channel 1, 6 or 11 which are the least congested channels for WiFi signals. If using a dual-band router, make this change on the 2.4Ghz band which the SIGNATURE thermostat uses to connect to your WiFi router. 

I can't connect to my WiFi network
  • Cause
    Solution

  • WiFi router is set to mixed encryption
    Some WiFi routers are factory defaulted to a mixed encryption type meaning it is can be compatible with WPA as well as WPA2 encryption types. When the security setting on the WiFi router is set mixed encryption type, certain routers cannot connect to the SIGNATURE thermostat. In your WiFi router’s security settings, change the encryption type to WPA2 only (newer and more secure encryption type than WPA) and try reconnecting your SIGNATURE thermostat to your WiFi network. If using a dual-band router, make this change on the 2.4Ghz band which the SIGNATURE thermostat uses to connect to your WiFi router. 

  • WiFi router requires a restart/reboot
    The problem might be with your router, even if your other wireless devices are still connected. A simple restart of the router will usually resolve these types of issues. While most routers just need to be unplugged and plugged back into their power source to restart them, you should refer to your router’s documentation for specific instructions.

  • WiFi router firmware needs to be updated
    Check that your WiFi firmware and drivers have been updated to the latest versions. Contact your Internet Service Provider (ISP) or the router manufacturer for instructions on how to update the firmware and drivers. They are usually available to download from the WiFi router manufacturer's website. 

  • Your network name is hidden
    If you have another device connected to your WiFi network such as your mobile phone, stand next to your SIGNATURE Thermostat and go into your phone’s WiFi Settings to see if the network name is appearing. If you do not see the network, it could mean that your network name is hidden. If your wireless network is hidden, it means you’ve chosen to not have the network name broadcasted to devices. In the WiFi Settings on the SIGNATURE, select ‘Other’ at the bottom and type in the name of your network (aka SSID). Then enter your password when you are prompted.

  • Thermostat is too far from WiFi router
    Try connecting another device such as your mobile phone to your WiFi network. Standing next to your SIGNATURE Thermostat, go into your phone’s WiFi Settings. If the WiFi signal cannot be detected or is very weak on your phone, it means other devices may have trouble connecting to the network from that area of the home. This means you may be too far away from your WiFi router or there may be a problem with it. If your WiFi router is too far, you can purchase a WiFi signal repeater which will improve the range of the WiFi signal in your home for all devices.

  • We have created troubleshooting trees to help troubleshoot Wi-Fi connection issues. See below.
The thermostat is 'Offline'
  • Cause
    Solution

  • WiFi router is set to mixed encryption
    Some WiFi routers are factory defaulted to a mixed encryption type meaning it is can be compatible with WPA as well as WPA2 encryption types. When the security setting on the WiFi router is set mixed encryption type, certain routers cannot connect to the SIGNATURE thermostat. In your WiFi router’s security settings, change the encryption type to WPA2 only (newer and more secure encryption type than WPA) and try reconnecting your SIGNATURE thermostat to your WiFi network.

  • WiFi router requires a restart/reboot
    The problem might be with your router, even if your other wireless devices are still connected. A simple restart of the router will usually resolve these types of issues. While most routers just need to be unplugged and plugged back into their power source to restart them, you should refer to your router’s documentation for specific instructions.

  • Your WiFi router is not connected to the internet
    Check your WiFi router to ensure it is online. See if other devices connected to your WiFi network are still connected. If other devices are also disconnected from your WiFi network, there may be a problem with your ISP (Internet Service Provider), or your WiFi router. Try restarting your router or ensure your password or security settings hasn’t changed.

  • Server maintenance
    On occasion and usually in off-peak hours only, our database is being updated so we will take the server offline momentarily while the updates are taking place. It should only be offline for 1-2 minutes before it’s online again. Try logging off and logging back in.

  • WiFi router firmware needs to be updated

    Check that your WiFi firmware and drivers have been updated to the latest versions. Contact your Internet Service Provider (ISP) or the router manufacturer for instructions on how to update the firmware and drivers. They are usually available to download from the WiFi router manufacturer's website. 


The SIGNATURE Thermostat screen says “Thermostat is not functioning properly. Please contact Nuheat.”
  • Cause
    Solution

  • Floor sensor is damaged or not connected properly
    Go into SETTINGS, THERMOSTAT INFO, PAGE 2 and check the status of the Floor Sensor. If the status is 'Fail', it could mean that the floor sensor is not installed/connected properly. Loosen the screw at the bottom of the faceplate and remove the faceplate. Ensure there are two small black sensor wires are securely connected to Terminals C and D. It does NOT matter which wire is inserted into each terminal. Re-install the faceplate and check if the error message appears again. If yes, contact your installer to replace the floor sensor which may be damaged. 

    If the floor sensor is damaged and you wish to control your floor heating system using the ambient/air temperature for the time being, go to SETTINGS, SETUP/PREFERENCES and change 'Temp. control' and 'Temp. display' to Air/Room Temp. The SIGNATURE thermostat will now display the ambient/air temperature and control the floor heating system based on the ambient/air temperature of the room. Switch both Temp control and ‘Temp display’ settings back to Floor temp once the floor sensor is replaced. 

  • Floor sensor is missing

    Go into SETTINGS, THERMOSTAT INFO, PAGE 2 and check the status of the Floor Sensor. If the status is 'Fail', it could mean that the floor sensor is ​missing. Loosen the screw at the bottom of the faceplate and remove the faceplate. Confirm that there are two small black sensor wires securely connected to Terminals C and D. If there are no wires present, contact your installer to install the floor sensor that came with the thermostat. 

    If the floor sensor is missing and you wish to control your floor heating system using the ambient/air temperature for the time being, go to SETTINGS, SETUP/PREFERENCES and change 'Temp. control' and 'Temp. display' to Air/Room Temp. The SIGNATURE thermostat will now display the ambient/air temperature and control the floor heating system based on the ambient/air temperature of the room. Switch both Temp control and ‘Temp display’ settings back to Floor temp once the floor sensor is installed.


The time on the SIGNATURE Thermostat is incorrect.
  • Cause
    Solution

  • Weather Settings has not been setup.
    On the thermostat, go into SETTINGS > WEATHER SETTINGS. Click ‘Change’ and enter in your zip/postal code. Once you complete the weather setup, the time will be based on your time zone. The ‘Sync with network time’ feature in the Time setup maintains the clock’s accuracy over time. However, the SIGNATURE Thermostat relies on the zip/postal code to attribute the correct time zone.

I am connected to my WiFi network but when I try to setup my weather, it says the “Thermostat must be connected to WiFi network to retrieve weather location.”
  • Cause
    Solution

  • This is just a reminder
    Press 'Change' and complete the setup process. After completion, the thermostat will take about 30 seconds to retrieve the weather information.

My weather information is not accurate
  • Cause
    Solution

  • Wrong ZIP/Postal code
    Check your zip code (SETTINGS > WEATHER SETTINGS) to ensure the proper ZIP/Postal code was entered.

  • Change in weather between update periods
    The weather information on the SIGNATURE thermostat is updated every three hours from the weather database. Although it is fairly accurate and up-to-date, weather changes that occur between update periods may not be reflected on the thermostat.

Floor type and Floor limit features are shaded out and not selectable.
  • Cause
    Solution

  • Temperature control setting is set to be controlled using the air/room temperature
    Go to SETTINGS, SETUP/PREFERENCES, change Temp. control and Temp. display settings to Floor temp.

    After this change, if you see a message on the screen that says "Thermostat is not functioning properly. Please contact Nuheat.", refer to troubleshooting steps under "The SIGNATURE Thermostat screen says “Thermostat is not functioning properly. Please contact Nuheat.”

    Note: When the temperature control setting is set to Room, it ignores the readings from the floor sensor. Without a temperature reading, Floor type and Floor limit features are not possible.

The floor/room temperature information on the app and the website is different than the temperature on the thermostat.
  • Cause
    Solution

  • Time required to sync devices/websites
    Any changes on the Nuheat SIGNATURE app, the MyNuheat.com website, or the SIGNATURE Thermostat is communicated to the Nuheat server. The server then pushes the new information out to the other devices. Sometimes there is a slight delay before the information is synced on all the devices.

I can’t control my SIGNATURE via my Nuheat SIGNATURE app
  • Cause
    Solution

  • Wrong app was downloaded
    Make sure you've downloaded the Nuheat SIGNATURE app. The app logo should be the red Nuheat "foot".

  • Thermostat is offline
    Check your WiFi router to ensure it is functioning properly and that you have wireless internet service in the home. Refer to troubleshooting steps under "The thermostat is offline". 

I can’t download the Nuheat App on my iPad
  • Cause
    Solution

  • Nuheat SIGNATURE app is categorized as iPhone app
    When you open the App Store on your iPad, on the top, select ‘iPhone only’ and you will see the Nuheat SIGNATURE app. The Nuheat SIGNATURE app was created and optimized for smartphones. The app still fully functions on a tablet but it doesn’t stretch to the full tablet screen.

I don't know how to get started
  • Cause
    Solution

  • Complete the WiFi setup process for the SIGNATURE thermostat
    In order to access all the wireless features of the SIGNATURE thermostat, you must first connect the SIGNATURE thermostat to your WiFi network. Go into SETTINGS > WIFI SETTINGS and complete the WiFi setup. Once the thermostat is connected to your WiFi network, you will be asked for an email address to begin your MyNuheat.com account setup. An email with an activation link and instructions will be sent to that email address. After your MyNuheat.com account is setup, you can control your SIGNATURE thermostat(s) via MyNuheat.com or download the Nuheat Signature App from the App Store or Google Play.

I have not received an activation email in my inbox to register the SIGNATURE Thermostat
  • Cause
    Solution

  • Email is blocked by your SPAM filters
    Check your SPAM folder in your inbox or try another email address. To attempt a resend of the Activation Email, go to www.mynuheat.com:

    1. Enter the email address that you used to complete the WiFi setup on the Signature thermostat.
    2. Click on 'Forgot Password'
    3. Re-enter the email address.

    You will be sent a temporary password that you can use to log in and setup your MyNuheat.com profile.

  • Wrong email was entered into the thermostat
    On the SIGNATURE Thermostat, go into SETTINGS, THERMOSTAT INFO and confirm the email account was entered correctly.

The screen display is distorted or not responsive
  • Cause
    Solution

  • The faceplate is not properly mounted to the power base
    Loosen (but do not remove) the screw at the bottom of the faceplate to detach the faceplate from the power base. Inspect the faceplate and back plate for signs of damage or loose debris at the connector pin location. Re-attach the faceplate to the ​power base and check if the distortion has disappeared.

  • The screen needs to be re-calibrated
    1. Loosen the screw at the bottom of the faceplate and remove the faceplate from the power base.
    2. With ​the disconnected faceplate, press & hold your finger down on the center of the touchscreen. 
    3. With your finger still pressing the center of the screen, re-mount the faceplate onto the power base. You should see the thermostat has now entered its ‘Calibration mode’
    4. Follow the instructions on the screen and press and hold the red dot on the corners of the screen until you see the word “Release!” appear on the screen. 
    5. When the calibration is complete, the screen will begin a countdown from 5 seconds. Before the countdown expires, press the screen to accept the new calibration. 

The thermostat is heating outside of the programmed schedule
  • Cause
    Solution

  • The Early Start feature is enabled/on.
    The Early Start features uses a predictive algorithm that takes your floor's heating/cooling characteristics and uses it to determine the amount of time it needs to heat (aka "pre-heat") the floor in order for the floor temperature to reach the target temperature in your schedule/programming. Pre-heating is a normal behavior if the Early Start feature is enabled/on.

    To ​disable the Early Start function, go to SETTINGS, SETUP/PREFERENCES, PAGE 2. Select Early Start and choose Off. Click Save. 

    Note: If Early Start is disabled, the floor will only begin heating AT the time in your program/schedule. If you want the floor to be warm by the time set in your program/schedule but you do not want to enable the Early Start feature, we suggest setting the start time in your program/schedule at least 30-60 minutes before the expected time you want the floor to be warm. 

The thermostat is under/overshooting the target floor temperature
  • Cause
    Solution

  • Temp Display and Temp Control settings are set to different modes/settings
    The Temp Display setting allows you to choose to DISPLAY the floor temperature OR the ambient/air temperature in the room. This temperature is displayed as the large number on the home screen of the thermostat. 

    The Temp Control setting allows ​you to choose whether to CONTROL the floor heating system using the floor temperature OR the ambient/air temperature in the room. 

    The recommend setting is to set both to Floor temperature. This means the thermostat will display the floor temperature and use the floor temperature to heat or not heat the floor. 

  • Thermostat is learning the heating/cooling characteristics of your floor
    The thermostat should maintain the floor temperature (or ambient/air temperature depending on the Temp Control setting) within 1-2 degrees of the target temperature which is the small number on the home screen of the thermostat. If it overshoots/undershoots the target, it is due to the thermostat needing to learn the heating/cooling characteristic of your floor. This behavior is most prominent in installations where the system is turned on for the first time. It will take 3-5 days of uninterrupted heating/cooling for the thermostat to learn the floor's heating/cooling characteristics. It can also be triggered by a sudden change in temperature or heat loss in the room (eg. caused by weather). This will also temporarily affect the accuracy/ability to maintain the target temperature. After 3-5 days of uninterrupted heating/cooling, the thermostat will adapt to the new temperature characteristics of the floor. 

The Signature thermostat unexpectedly sets itself to indefinite hold at 41F (5C)
  • Cause
    Solution

  • Works With Nest integration is enabled
    If you have connected the Nuheat Signature thermostat to the Works With Nest integration, whenever the Nest thermostat is manually/automatically set to Away, it signifies to the Signature thermostat that no one is home. The Signature thermostat will override the programming and not heat the floor until the Nest product ​detects home occupancy and changes to Home setting/status. When the Nest product goes to Home setting/status, the Signature will return to its regular heating program/schedule. 

How to use the Away Mode feature
  • Cause
    Solution

  • Using the Away Mode feature
    See the nVent NUHEAT Blog post here on how to use your Signature thermostat's away mode. 

How to create a Wi-Fi hot spot on Android and iOS
  • Cause
    Solution

  • How to create a Wi-Fi hot spot on Android
    If you have an Android device, simply follow these instructions to create a Wi-Fi hot spot. 

    1.  Open the Settings app. 
    2.  Press the Network & Internet option. 
    3.  Press the hot spot & tethering option. 
    4.  Toggle the switch next to Wi-Fi hot spot to on. 
    5.  Tap Set up Wi-Fi hot spot to manage name and password settings for your hot spot. 

    After that is done, you should be able to find the Wi-Fi network from your other devices.

    When you are done, simply follow the instructions again and toggle the switch in step 4 back to the off position. 

  • How to create a Wi-Fi hot spot on iOS
    If you are using an iPhone running, here is how to create a Wi-Fi hot spot. 

    1.  Open the Settings app. 
    2.  Tap Personal hot spot. 
    3.  Switch the slider next to Personal hot spot to the on position. 
    4.  From that same screen, you can edit your Wi-Fi password. 

    After that is done, you should be able to access your Wi-Fi hot spot. When you are done, simply follow the instructions again and switch the slider in step 3 back to the off position to turn off the Wi-Fi network. 

Thermostat_Home_front


Please click here to visit our nVent Thermal YouTube channel to access installation videos for our nVent Nuheat Signature, Home and Element thermostats.

The red light is on or blinking on the thermostat.
  • Cause
    Solution

  • The GFCI Test button has been pressed manually.
    When the GFCI Test Button has been pressed, the screen will display “GFCI Error – Ground fault detected” and the RED light will be activated. This is normal. Cancel the error message by pressing the Reset Button (on the lower right side of the thermostat) once.

    This message is supposed to appear each time you press this button as you are testing to ensure that  the GFCI safety feature works, much like testing an alarm. 

  • The Ground Fault Circuit Interrupter (GFCI) has been triggered.
    Determine the blinking pattern: 

    Solid red light
     – press the on/off button to reset the GFCI.

    If the red light on your unit is located at the TOP or on the RIGHT side of the thermostat and the red light does not turn off, this indicates that there is a ground fault in the heating system. Contact your electrician or installer to verify the wiring and test the system with a digital multimeter

    Slow blink - Press the on/off button to reset the GFCI.

    Fast blink
     - This indicates that there is a ground fault in the heating system. Call your electrician or installer to verify the wiring and test the system with a digital multimeter

  • The system has not been wired or grounded properly.
    The electrician needs to inspect the wiring of the thermostat and mats/cable. Have the electrician see steps below for instructions.

  • If the causes above do not solve the issue, please follow the instructions below.
    • Steps for Homeowner:
      1. At the thermostat location, press the reset button located on the bottom right side of the thermostat faceplate once to see if the error message and RED light will reset (click here to open the Operating Manual for reference). 
        1. If the error message and RED light disappear, set the thermostat to 'Heat' and allow the floor to heat up.
          1. If the floor heats and the error message and RED light do not reappear, continue to operate the system normally.
          2. If the thermostat trips the GFCI as soon as the heating indicators are displayed on the screen, please call your electrician and proceed to electrician troubleshooting (Step 2). 
        2. If the error and RED light do not disappear, turn OFF the circuit breaker controlling the floor heating circuit. Leave the breaker OFF for 10 seconds, then turn the breaker back ON.
          1. If the thermostat resets and the floor heats up, continue to operate the system normally.
          2. If the thermostat displays the error message and RED light as soon as the power is turned back ON, contact an electrician and have them come to the site to perform the steps noted below.

    • Steps for Electrician:
      A. Please read and follow the steps noted below.
      B. If the issues are not resolved, or if any assistance is required, we recommend that the electrician and homeowner call nVent NUHEAT Tech Support when the electrician is on site so that we can ensure all trouble shooting steps have been conducted properly and explain any next steps.


      1.  At the breaker panel, turn OFF the circuit breaker controlling the floor heating circuit.

        1. Confirm the supply breaker is a standard breaker (not GFCI)

          • If the breaker is a GFCI, replace with a standard breaker and attempt to heat the floor.
        2. Confirm if the supply breaker is a dedicated line, only connected to the floor heating system.

          • If the line is shared with other appliances, correct the wiring to comply with installation requirements (dedicated circuit). 
      2. At the thermostat location, remove the faceplate (there is a small screw at the bottom of the faceplate - loosen the screw but do not remove it) and remove the thermostat base from the wall. 

      3. Inspect the wiring at the back of the thermostat and in the junction box in the wall.

        • Ensure that there is no damage to the wires or thermostat.
        • Ensure that the system is grounded properly. The braided metallic shields of the mat/cable should be tied to the grounding screw or copper in the junction box.
        • Verify the wiring to the correct wiring diagram for the unit.
      4. Disconnect the mat/cable (load) wires connected to terminals 1 & 4 on the thermostat backplate.

      5. Using the digital multimeter with a fully charged battery set to 200 Ohms, perform the Resistance and Insulation tests. Instructions for how to perform these tests can be found in the HOME Manual here.

        Testing Notes

        Ensure all Insulation and Resistance testing is done at the factory cold lead location. If the mat or cable cold lead (load wire) has been terminated in a junction box (other than the thermostat location), you will need to access and test from the factory cold lead location.

        If there are multiple cold leads (load wires) from the floor, test each mat/cable cold lead separately and record your findings for each.

        For 240 V mats or cables that are 20 sq. ft. or smaller, you will need to set your digital multi-meter to 2K ohms

        1. If the Ohms reading for the Resistance test is outside the testing parameters (more than 10% above/ 5% below or showing an open line) then the heating element has been affected and will need to be inspected by a technician.

          1. Measure the voltage on the line side of the thermostat and ensure that it is the same voltage the load is rated for.

            • If the line voltage matches the load voltage, click here to fill out the Repair Request form. Please make note of the Ohms and Insulation tests readings, notes on troubleshooting steps taken. Please take a photographic of the mat/cable UL/CSA tag that is on the end of the lead wires.
            • If the line voltage measured is higher than the voltage rating for the load, the heating element is not repairable.
        2. If the Ohms reading for the Insulation test is outside the testing parameters (any Ohms reading other than an open line) then the heating element has been affected and will need to be inspected by a technician.

          1. Measure the voltage on the line side of the thermostat and ensure that it is the same voltage the load is rated for.
            • If the line voltage matches the load voltage, click here to fill out the Repair Request form. Please make note of the Ohms and Insulation tests readings, notes on troubleshooting steps taken. Please take a photograph of the mat/cable UL/CSA tag that is on the end of the lead wires.
            • If the line voltage measured is higher than the voltage rating for the load, the heating element is not repairable.
      6. If the Insulation and Resistance tests pass inspection (Step 5), the next steps is to test the thermostats built-in GFCI.

        1. At the breaker panel, turn OFF the circuit breaker controlling the floor heating circuit.

          • Disconnect the mat/cable (load) wires connected to terminals 1 & 4 on the thermostat backplate.
          • Turn ON the circuit breaker controlling the floor heating circuit.
          • If it did not come on by itself, press & hold the ON/OFF button located on the bottom right side of the thermostat faceplate) for 4 seconds.
          • Set the thermostat to 'Heat' the floor
        2. If the thermostat trips the GFCI with no load attached, then the thermostat's GFCI/full unit will need to be replaced. Please check the proof of purchase for the purchase date. For thermostats within the 3 year warranty period, Click here to complete the Thermostat Backplate Replacement Form. Proof of Purchase and a photo of the back of the faceplate of the unit is required for all warranty replacements. 

          For units past the warranty period, please purchase a new thermostat from an authorized dealer and have a certified electrician install it. There is a Where To Buy tool and Find An Installer on www.nuheat.com or contact customer care to help you locate a authorized dealer.

        3. If the thermostat DOES NOT trip the GFCI

          • Reattach the mat/cable (load) wires to thermostat terminals 1 & 4 and set the thermostat to a 'Heat'.

            • If the thermostat trips the GFCI only when a load is attached then the issue is in the floor and a site visit from a repair technician is required. Click here to submit the Repair Request form. Please make note of the Ohms and Insulation tests readings, notes on troubleshooting steps taken. Please take a photograph of the mat/cable UL/CSA tag that is on the end of the lead wires. 
          • Please call nVent NUHEAT Tech Support to ensure that the troubleshooting steps have been conducted properly.


    For a downloadable PDF of these instructions, please click here.
The screen is blank.
  • Cause
    Solution

  • The unit is turned off.
    Turn the unit on by pressing the on/off button on the right side of the thermostat. Wait several seconds for the screen to turn on.

  • There is no power going to thermostat.
    Press the GFCI test button ​at the top of the thermostat. If the red light at the top of the thermostat (or on the right side depending on the thermostat model) turns on, this ​indicates that there is power to the thermostat. If not, confirm that the circuit breaker on the electrical panel is ON and/or contact your electrician to confirm/check the wiring.

  • The thermostat is no longer functioning.

    If the unit was previously functioning properly and now the faceplate is blank and if there is power to the unit and attempts to turn the unit on has been unsuccessful, then the thermostat needs to be replaced. Please check your proof of purchase for purchase date. If your unit is within the 3 year warranty period, please contact nVent NUHEAT Customer Care at 1-800-778-WARM (9276).  Proof of purchase is required.

    For units past the warranty period, please purchase a new thermostat from an authorized dealer and have a certified electrician install it. There is a Where To Buy tool and Find An Installer tool on www.nuheat.com or contact customer care to help you locate a authorized dealer.


  • Wiring on back of thermostat is reversed.

    For brand new installs, if the thermostat is blank, most likely the wiring for the line and load terminals have been switched. See Steps for the Electrician below.


  • If the causes above do not solve the issue, please follow the instructions below.
    • Steps for Homeowner
      1. At the breaker panel, confirm the circuit breaker controlling the floor heating circuit is ON.
        1. Cycle the breaker OFF. Hold the breaker OFF for 10 Seconds and then turn the breaker back ON.
      2. At the thermostat, press & hold the ON/OFF button (located on the bottom right side of the thermostat faceplate) for 4 seconds, then release and wait 4 seconds to see if the screen display turns on.

      3. If the screen does not turn on, press the GFCI Test Button (located on the top of the thermostat) and check for a flashing RED light (located either on the top or right side of the thermostat). 

        1. If the thermostat screen remains blank and the RED light activated when the Test Button was pressed, then the thermostat needs to be replaced. Please check your proof of purchase for the purchase date. For thermostats within the 3 year warranty period, click here to complete the Thermostat Faceplate Replacement Form. Proof of purchase and a photo of the back of the faceplate of the unit is required for all warranty replacements. 
        2. If the RED light does not appear, contact an electrician and have them come to the site to perform steps 4 to 6 using a digital multimeter.

    • Steps for Electrician
      1. At the thermostat junction box location, confirm there is power (120 V / 208 V / 240 V) at the line side of the thermostat (terminals 2 & 3 on the thermostat back plate).
      2. Confirm the wiring is correct (click here for the quick start wiring guide).
        1. Incoming power to terminals 2 & 3
        2. Load wires connected to terminals 1 & 4
        3. Braided ground shield tied to the house ground
      3. If the voltage and wiring are correct and the screen is still blank, please check your proof of purchase for the purchase date. For thermostats within the 3 year warranty period, click here to complete the Thermostat Backplate Replacement Form.​ Proof of purchase and a photo of the back of the faceplate of the unit is required for all warranty replacements. 

      4. For units past the warranty period, please purchase a new thermostat from an authorized dealer and have a certified electrician install it. There is a Where To Buy tool and Find An Installer tool on www.nuheat.com or contact customer care to help you locate a authorized dealer.



    For a downloadable PDF of these instructions, please click here.
The HOME thermostat screen says “Thermostat is not functioning properly. Please contact Nuheat.”
  • Cause
    Solution

  • Floor sensor is damaged or not connected properly
    Go into SETTINGS, THERMOSTAT INFO, PAGE 2 and check the status of the Floor Sensor. If the status is 'Fail', it could mean that the floor sensor is not installed/connected properly. Loosen the screw at the bottom of the faceplate and remove the faceplate. Ensure there are two small black sensor wires are securely connected to Terminals C and D. It does NOT matter which wire is inserted into each terminal. Re-install the faceplate and check if the error message appears again. If yes, contact your installer to replace the floor sensor which may be damaged. 

    If the floor sensor is damaged and you wish to control your floor heating system using the ambient/air temperature for the time being, go to SETTINGS, SETUP/PREFERENCES and change 'Temp. control' and 'Temp. display' to Air/Room Temp. The SIGNATURE thermostat will now display the ambient/air temperature and control the floor heating system based on the ambient/air temperature of the room. Switch both Temp control and ‘Temp display’ settings back to Floor temp once the floor sensor is replaced. 

  • Floor sensor is missing

    Go into SETTINGS, THERMOSTAT INFO, PAGE 2 and check the status of the Floor Sensor. If the status is 'Fail', it could mean that the floor sensor is ​missing. Loosen the screw at the bottom of the faceplate and remove the faceplate. Confirm that there are two small black sensor wires securely connected to Terminals C and D. If there are no wires present, contact your installer to install the floor sensor that came with the thermostat. 

    If the floor sensor is missing and you wish to control your floor heating system using the ambient/air temperature for the time being, go to SETTINGS, SETUP/PREFERENCES and change 'Temp. control' and 'Temp. display' to Air/Room Temp. The SIGNATURE thermostat will now display the ambient/air temperature and control the floor heating system based on the ambient/air temperature of the room. Switch both Temp control and ‘Temp display’ settings back to Floor temp once the floor sensor is installed.


The HOME thermostat is heating outside of the programmed schedule
  • Cause
    Solution

  • The Early Start feature is enabled/on
    The Early Start features uses a predictive algorithm that takes your floor's heating/cooling characteristics and uses it to determine the amount of time it needs to heat (aka "pre-heat") the floor in order for the floor temperature to reach the target temperature in your schedule/programming. Pre-heating is a normal behavior if the Early Start feature is enabled/on. 

    To disable the Early Start function, go to SETTINGS, SETUP/PREFERENCES, PAGE 2. Select Early Start and choose Off. Click Save. 

    Note: If Early Start is disabled, the floor will only begin heating AT the time in your program/schedule. If you want the floor to be warm by the time set in your program/schedule but you do not want to enable the Early Start feature, we suggest setting the start time in your program/schedule at least 30-60 minutes before the expected time you want the floor to be warm. 
     

The HOME thermostat is under/overshooting the target floor temperature
  • Cause
    Solution

  • Temp Display and Temp Control settings are set to different modes/settings

    The Temp Display setting allows you to choose to DISPLAY the floor temperature OR the ambient/air temperature in the room. This temperature is displayed as the large number on the home screen of the thermostat. 

    The Temp Control setting allows ​you to choose whether to CONTROL the floor heating system using the floor temperature OR the ambient/air temperature in the room. 

    The recommend setting is to set both to Floor temperature. This means the thermostat will display the floor temperature and use ​the floor temperature to heat or not heat the floor.


  • Thermostat is learning the heating/cooling characteristics of your floor

    The thermostat should maintain the floor temperature (or ambient/air temperature depending on the Temp Control setting) within 1-2 degrees of the target temperature which is the small number on the home screen of the thermostat. If it overshoots/undershoots the target, it is due to the thermostat needing to learn the heating/cooling characteristic of your floor. This behavior is most prominent in installations where the system is turned on for the first time. It will take 3-5 days of uninterrupted heating/cooling for the thermostat to learn the floor's heating/cooling characteristics. It can also be triggered by a sudden change in temperature or heat loss in the room (eg. caused by weather). This will also temporarily affect the accuracy/ability to maintain the target temperature. After 3-5 days of uninterrupted heating/cooling, the thermostat will adapt to the new temperature characteristics of the floor.


The screen's display is distorted or not responsive
  • Cause
    Solution

  • The faceplate is not properly mounted to the power base
    Loosen (but do not remove) the screw at the bottom of the faceplate to detach the faceplate from the power base. Inspect the faceplate and back plate for signs of damage or loose debris at the connector pin location. Re-attach the faceplate to the ​power base and check if the distortion has disappeared.

  • The screen needs to be re-calibrated
    1. Loosen the screw at the bottom of the faceplate and remove the faceplate from the power base.
    2. With the disconnected faceplate, press & hold your finger down on the center of the touchscreen. 
    3. With your finger still pressing the center of the screen, re-mount the faceplate onto the power base. You should see the thermostat has now entered its ‘Calibration mode’
    4. Follow the instructions on the screen and press and hold the red dot on the corners of the screen until you see the word “Release!” appear on the screen. 
    5. When the calibration is complete, the screen will begin a countdown from 5 seconds. Before the countdown expires, press the screen to accept the new calibration. 

     

Floor type and Floor limit features are shaded out and not selectable.
  • Cause
    Solution

  • Temperature control setting is set to be controlled using the air/room temperature

    Go to SETTINGS, SETUP/PREFERENCES, change Temp. control and Temp. display settings to Floor temp. 

    After this change, if you see a message on the screen that says "Thermostat is not functioning properly. Please contact Nuheat.", refer to troubleshooting steps under "The ​HOME Thermostat screen says “Thermostat is not functioning properly. Please contact Nuheat.”

    Note: When the temperature control setting is set to Room, it ignores the readings from the floor sensor. Without a temperature reading, Floor type and Floor limit features are not possible.


Thermostat_Element_front


Please click here to visit our nVent Thermal YouTube channel to access installation videos for our nVent Nuheat Signature, Home and Element thermostats.

Screen says E02
  • Cause
    Solution

  • Floor sensor is damaged or not connected properly
    Loosen the screw at the bottom of the faceplate and remove the faceplate. Ensure there are two small black sensor wires are securely connected to Terminals C and D. It does NOT matter which wire is inserted into each terminal. Re-install the faceplate and check if the error message appears again. If yes, contact your installer to replace the floor sensor which may be damaged. 

    If the floor sensor is damaged and you wish to control your floor heating system using the ambient/air temperature for the time being, double tap the center button to enter the menu mode, go to the FLOOR/ROOM setting and change the sensor selection from ‘floor’ to ‘/ room’ .

    The ELEMENT thermostat will now display the ambient/air temperature and control the floor heating system based on the ambient/air temperature of the room.

  • Floor sensor is missing
    Loosen the screw at the bottom of the faceplate and remove the faceplate. Confirm that there are two small black sensor wires securely connected to Terminals C and D. If there are no wires present, contact your installer to install the floor sensor that came with the thermostat. 

    If the floor sensor is damaged and you wish to control your floor heating system using the ambient/air temperature for the time being, double tap the center button to enter the menu mode, go to the FLOOR/ROOM setting and change the sensor selection from ‘floor’ to ‘/ room’ .

    The ELEMENT thermostat will now display the ambient/air temperature and control the floor heating system based on the ambient/air temperature of the room.

Temperature is flashing.
  • Cause
    Solution

  • The floor temperature is higher than the allowable limit for your selected floor type.
    The maximum temperature limit of the thermostat is 104°F / 40°C for tile floors (82°F / 28°C for laminate/engineered wood floors). If the floor sensor detects a floor temperature that is above that limit, it will not allow the floor heating system to be turned on. During this time, the temperature will flash on the display until the floor temperature drops below these limits.

"Err 06" reading on the screen
  • Cause
    Solution

  • The ambient temperature sensor is shorted.
    If a floor sensing probe was installed in the floor, switch the thermostat to Floor mode. If the thermostat is 3 years or older, it has reached it's end of life and needs to be replaced. See Where to Buy on Page 1.

"Err 05" reading on the screen
  • Cause
    Solution

  • The ambient temperature sensor circuit is open.
    If a floor sensing probe was installed in the floor, switch the thermostat to Floor mode. If the thermostat is 3 years or older, it has reached it's end of life and needs to be replaced. See Where to Buy on Page 1.

"Err 04" reading on the screen
  • Cause
    Solution

  • The floor sensor is shorted. This can happen, for example, if a nail or screw has been driven through the wires.
    Call your tile setter to replace floor sensing probe or remove the sensor probe wires from the thermostat and switch the setting to read Ambient temperature only. Please refer to the SOLO Manual on the Nuheat Thermostat Past Models page here.

"Err 03" reading on the screen
  • Cause
    Solution

  • The floor sensor circuit is open. This can be caused by a cut in the floor sensing probe wires.
    Call your tile setter to replace floor sensing probe or remove the sensor probe wires from the thermostat and switch the setting to read Ambient temperature only. Please refer to the SOLO Manual on the Nuheat Thermostats Past Models page here.


"Err 02" reading on the screen
  • Cause
    Solution

  • There is a short in the network wires. This can indicate the terminal polarity was not observed during the network cable connections.
     Although the error code appears only on the master thermostat, the short or bad connection can be anywhere in the network.

    Call electrician to ensure polarity of network wires is correct.

"Err 01" reading on the screen
  • Cause
    Solution

  • Two or more thermostats have been configured as "master" in the same network. Only one thermostat per network must be configured as "master".
    Refer to programming instructions and reconfigure one thermostat as the master.

Back light flashes continually.
  • Cause
    Solution

  • Thermostat has reached its end of life.
    1. Please check your receipts for purchase date of your unit. If your unit is past the three year warranty date, please click here to view an overview of our current thermostat options. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice. If your unit is within the three year warranty date, then call Nuheat at 1-800-778-9276.

"LO" reading on the screen
  • Cause
    Solution

  • The ambient or floor temperature reading is lower than 32°F (0°C). Although the thermostat does not display temperatures below that value, it continues to operate and control the temperature.
    No corrective action is necessary.

"HI" reading on the screen
  • Cause
    Solution

  • The temperature reading is higher than 158°F (70°C). Although the thermostat does not display temperatures above that value, it continues to operate and control the temperature.
    No corrective action is necessary.

Control shows a cool floor temperature but floor feels warm. Heating indicator bars are showing.
  • Cause
    Solution

  • Probe placement not on heating area.
    Call your tile setter to: Option 1 - If the thermostat has an Ambient Sensing feature, refer to the programming instructions and switch to Ambient Mode. Option 2 - Remove flooring and reposition probe. Option 3 - Disconnect existing probe and replace with new probe and position properly.

Control showing much higher temperature than set
  • Cause
    Solution

  • Probe in direct sunlight, near other heat source or under obstruction (i.e. furniture).
    Call your tile setter to: Option 1 - If the thermostat has an Ambient Sensing feature, refer to the programming instructions and switch to Ambient Mode. Option 2 - Remove flooring and reposition probe. Option 3 - Disconnect existing probe and replace with new probe and position properly.

  • Thermostat has reached its end of life.

    Please check your receipts for purchase date of your unit. If your unit is past the three year warranty date, please click here to view an overview of our current thermostat options. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice. If your unit is within the three year warranty date, then call Nuheat at 1-800-778-9276.


Programmable thermostat turns ON before programmed set time
  • Cause
    Solution

  • This is not a malfunction. Early start feature is ON.
    If not desired, refer to programming instructions and disable Early Start feature in thermostat settings.

Programmable thermostat won't hold a program
  • Cause
    Solution

  • The thermostat has reached its end of life or is no longer functioning.
    Call your electrician to determine if it is a connection issue or thermostat issue. If it is an issue with the thermostat, and it is within the units warranty period, call Nuheat at 1-800-778-9276. If the thermostat is past the 3 year warranty time, it needs to be replaced with a new thermostat. See Where to Buy tool on 1st page.

  • Thermostat programs are not set properly
    Check out programming instructions and re-program the thermostat. Please refer to the SOLO Manual on the Nuheat Thermostat Past Models page here.

Floor heats but GFCI light turns on OCCASIONALLY
  • Cause
    Solution

  • The thermostat has reached its end of life or is no longer functioning.
    Call your electrician to determine if it is a connection issue or thermostat issue. If it is an issue with the thermostat, and it is within the units warranty period, call Nuheat at 1-800-778-9276. If the thermostat is past the 3 year warranty time, it needs to be replaced with a new thermostat. See Where to Buy tool on 1st page

  • Bathroom fans when switched on or off could be emitting electrically noise, causing the GFCI to trip
    Call your electrician in and have them call Nuheat for correct information. Please refer to the SOLO Manual on the Nuheat Thermostat Past Models page here.
    Check out programming instructions and re-program the thermostat. Please refer to the SOLO Manual on the Nuheat Thermostat Past Models page here.

    Check out programming instructions and re-program the thermostat. Please refer to the SOLO Manual on the Nuheat Thermostat Past Models page here.

    Check out programming instructions and re-program the thermostat. Please refer to the SOLO Manual on the Nuheat Thermostat Past Models page here.


GFCI light is on
  • Cause
    Solution

  • Unit needs to be reset

  • Nuheat system has been damaged.
    Call your electrician to perform insulation and resistance tests as per installation instructions. If mat is damaged & you know where the break is; your electrician can make the repair using a Nuheat Mat Repair Kit that is ordered from your local Nuheat dealer. If it is not known where the break is, please fill out the Repair Request form here.

  • Halogen lights installed or other electrical noicse is causing it to trip or the system was not installed on a dedicated non-GFCI circuit
    Please fill out the Repair Request form here.

  • Nuheat system is not grounded properly
    Call your electrician in and have them check the wiring according the installation instructions and call Nuheat for correct information.

Programmable thermostat screen is blank
  • Cause
    Solution

  • No voltage to programmable thermostat
    Turn your breaker on. Call your electrician to check the wiring

  • Wiring is not correct or bad
    Call your electrician in and please refer to the SOLO Manual on the Nuheat Thermostat Page Models page here.

Why is the clock flashing?
  • Cause
    Solution

  • This means that the time has not been set.
    Follow the instructions in the virtual thermostat tutorial to learn how to set the time: nVent Nuheat Solo Virtual Thermostat

The °F or °C does not appear.
  • Cause
    Solution

  • The thermostat has been configured as a power regulator and therefore displays the percentage of heating power instead of the temperature.
    Refer to programming instructions to disable Regulator mode.

Time display is flashing.
  • Cause
    Solution

  • The thermostat was without power for more than 2 hours.
    Refer to programming instructions and re-program the thermostat.

Temperature does not change according to the programmed schedule.
  • Cause
    Solution

  • Thermostat is in Manual mode.
    Check that the thermostat is in Automatic mode. Refer to programming instructions and check the schedule and clock settings.

Wrong temperature is displayed.
  • Cause
    Solution

  • Verify that the sticker on the thermostat's screen has been removed.
    Remove the sticker.

Thermostat is hot
  • Cause
    Solution

  • Under normal operation, the thermostat housing may reach a temperature between 95°F (35°C) and 104°F (40°C).
    No corrective action is necessary.

Control shows a cool floor temperature but floor feels warm. Heating indicator bars are showing.
  • Cause
    Solution

  • Probe placement not on heating area.
    Call your tile setter to: Option 1 - If the thermostat has an Ambient Sensing feature, refer to the programming instructions and switch to Ambient Mode. Option 2 - Remove flooring and reposition probe. Option 3 - Disconnect existing probe and replace with new probe and position properly.

Control showing much higher temperature than set
  • Cause
    Solution

  • Probe in direct sunlight, near other heat source or under obstruction (i.e. furniture).
    Call your tile setter to: Option 1 - If the thermostat has an Ambient Sensing feature, refer to the programming instructions and switch to Ambient Mode. Option 2 - Remove flooring and reposition probe. Option 3 - Disconnect existing probe and replace with new probe and position properly.

  • Thermostat has reached its end of life.

    The Harmony Thermostat was discontinued in Fall 2016. Please check your receipts for purchase date of your unit. If your unit is past the three year warranty date, you can replace your Harmony thermostat with a newer model, visit our Thermostats page here. All of our current thermostat models can replace pre-existing models, the best match for the Harmony thermostat based on functionality is the HOME thermostat. The thermostat should be installed by a certified electrician of your choice. If your unit is within the three year warranty date, then call Nuheat at 1-800-778-9276.


Programmable thermostat turns ON before programmed set time
  • Cause
    Solution

  • This is not a malfunction. Early start feature is ON.
    If not desired, refer to programming instructions and disable Early Start feature in thermostat settings.

Programmable thermostat won't hold a program
  • Cause
    Solution

  • Thermostat has reached its end of life.

    The Harmony Thermostat was discontinued in Fall 2016. Please check your receipts for purchase date of your unit. If your unit is past the three year warranty date, you can replace your Harmony thermostat with a newer model, visit our Thermostats page here. All of our current thermostat models can replace pre-existing models, the best match for the Harmony thermostat based on functionality is the HOME thermostat. The thermostat should be installed by a certified electrician of your choice. If your unit is within the three year warranty date, then call Nuheat at 1-800-778-9276.


  • Thermostat programs are not set properly
    Check out programming instructions and re-program the thermostat.

Floor heats but test and reset light turns on OCCASIONALLY
  • Cause
    Solution

  • GFCI on unit is oversensitive.
    Have your electrician replace the thermostat.

  • Thermostat has reached its end of life.
    Discontinued Year: Fall 2016. If you would like to replace your Harmony thermostat with a newer model, visit our Thermostats page here. All of our current thermostat models can replace pre-existing models, the best match for the Harmony thermostat based on functionality is the HOME thermostat. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice.

Both test and reset lights are ON.
  • Cause
    Solution

  • Unit needs to be reset

  • Nuheat system has been damaged.
    Call your electrician to perform insulation and resistance tests as per installation instructions. If system is damaged, and you know where the break is; your electrician can make the repair using a Nuheat Mat Repair Kit that is ordered from your local Nuheat dealer. If you do not know where the break is, please submit a Repair Request Form here.

  • GFCI on unit is oversensitive.
    Have your electrician replace the thermostat. The Harmony Thermostat was discontinued in Fall 2016. If you would like to replace your Harmony thermostat with a newer model, visit our Thermostats page here. All of our current thermostat models can replace pre-existing models, the best match for the Harmony thermostat based on functionality is the HOME thermostat.

Programmable thermostat screen is blank
  • Cause
    Solution

  • No voltage to programmable thermostat.
    Turn your breaker on. Call your electrician to check the wiring.

  • Wiring is not correct.
    Call your electrician to check the wiring.

I need to replace my HARMONY thermostat with a newer model, what do I need to know?
  • Cause
    Solution

  • If your HARMONY thermostat no longer functions you will need to replace it with a newer Nuheat thermostat. In doing so, some modifications to your existing thermostat location will be required.
    The HARMONY thermostat was discontinued by Nuheat in the Fall of 2016.

    When you replace the HARMONY thermostat, you will be left with a wider hole in the junction box that you will need to fill in order to accommodate the reduced size of a newer Nuheat Thermostat. There are multiple ways to do this including implementing a mud reduction plate, but we recommend consulting your contractor or a drywall specialist for the best method. 

The clock is flashing
"Er" reading on the screen
  • Cause
    Solution

  • Wiring is done incorrectly.
    Call your electrician to verify the thermostat and sensor connections.

"HI" reading on the screen
  • Cause
    Solution

  • The measured temperature is above the thermostat’s display range. Heating is deactivated.
    No corrective action is necessary.

"LO" reading on the screen
  • Cause
    Solution

  • The measured temperature is below the thermostat’s display range. Heating is activated.
    No corrective action is necessary.

Control shows a cool floor temperature but floor feels warm. Heating indicator bars are showing.
  • Cause
    Solution

  • Probe placement not on heating area.
    Call your tile setter to: Option 1 - If the thermostat has an Ambient Sensing feature, refer to the programming instructions and switch to Ambient Mode. Option 2 - Remove flooring and reposition probe. Option 3 - Disconnect existing probe and replace with new probe and position properly.

Control showing much higher temperature than set
  • Cause
    Solution

  • Probe in direct sunlight, near other heat source or under obstruction (i.e. furniture).
    Call your tile setter to: Option 1 - If the thermostat has an Ambient Sensing feature, refer to the programming instructions and switch to Ambient Mode. Option 2 - Remove flooring and reposition probe. Option 3 - Disconnect existing probe and replace with new probe and position properly.

Floor heats but GFCI light turns on OCCASIONALLY
  • Cause
    Solution

  • GFCI on unit is oversensitive.
    Have your electrician replace the thermostat.

  • Thermostat has reached its end of life.

    Please check your receipts for purchase date of your unit. If your unit is past the three year warranty date, please click here to view an overview of our current thermostat options. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice. If your unit is within the three year warranty date, then call Nuheat at 1-800-778-9276.


GFCI light is on
  • Cause
    Solution

  • Unit needs to be reset
    Please refer to the Tempo User Manual on the Nuheat Thermostat Past Models page here.

  • Nuheat system has been damaged.
    Call your electrician to perform insulation and resistance tests as per installation instructions. If mat is damaged and you know where the break is; your electrician can make the repair using a Nuheat Mat Repair Kit that is ordered from your local Nuheat dealer. If it is not known, please submit the Repair Request Form here.

  • It has reached its end of life and needs to be replaced.
    Please check your receipts for purchase date of your unit. If your unit is past the three year warranty date, please click here to view an overview of our current thermostat options. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice. If your unit is within the three year warranty date, then call Nuheat at 1-800-778-9276. 
    Please check your receipts for purchase date of your unit. If your unit is past the three year warranty date, please click here to view an overview of our current thermostat options. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice. If your unit is within the three year warranty date, then call Nuheat at 1-800-778-9276.
    Please check your receipts for purchase date of your unit. If your unit is past the three year warranty date, please click here to view an overview of our current thermostat options. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice. If your unit is within the three year warranty date, then call Nuheat at 1-800-778-9276.
    Please check your receipts for purchase date of your unit. If your unit is past the three year warranty date, please click here to view an overview of our current thermostat options. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice. If your unit is within the three year warranty date, then call Nuheat at 1-800-778-9276.
    Please check your receipts for purchase date of your unit. If your unit is past the three year warranty date, please click here to view an overview of our current thermostat options. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice. If your unit is within the three year warranty date, then call Nuheat at 1-800-778-9276.P
    Please check your receipts for purchase date of your unit. If your unit is past the three year warranty date, please click here to view an overview of our current thermostat options. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice. If your unit is within the three year warranty date, then call Nuheat at 1-800-778-9276.
    Please check your receipts for purchase date of your unit. If your unit is past the three year warranty date, please click here to view an overview of our current thermostat options. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice. If your unit is within the three year warranty date, then call Nuheat at 1-800-778-9276.

Programmable thermostat screen is blank
  • Cause
    Solution

  • No voltage to programmable thermostat.
    Call your electrician to turn breaker on.

  • Thermostat has reached its end of life.
    Please check your receipts for purchase date of your unit. If your unit is past the three year warranty date, please click here to view an overview of our current thermostat options. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice. If your unit is within the three year warranty date, then call Nuheat at 1-800-778-9276. 

Control shows a cool floor temperature but floor feels warm. Heating indicator bars are showing.
  • Cause
    Solution

  • Probe placement not on heating area
    Call your tile setter to: Option 1 - If the thermostat has an Ambient Sensing feature, refer to the programming instructions and switch to Ambient Mode. Option 2 - Remove flooring and reposition probe. Option 3 - Disconnect existing probe and replace with new probe and position properly.

Control showing much higher temperature than set
  • Cause
    Solution

  • Probe in direct sunlight, near other heat source or under obstruction (i.e. furniture).
    Call your tile setter to: Option 1 - If the thermostat has an Ambient Sensing feature, refer to the programming instructions and switch to Ambient Mode. Option 2 - Remove flooring and reposition probe. Option 3 - Disconnect existing probe and replace with new probe and position properly.

Programmable thermostat turns ON before programmed set time
  • Cause
    Solution

  • This is not a malfunction. Early start feature is ON.
    If not desired, refer to programming instructions and disable Early Start feature in thermostat settings.

Programmable thermostat won't hold a program
  • Cause
    Solution

  • Thermostat has reached its end of life.

    Discontinued Year: 2008.If you would like to replace your MatComfort NTG thermostat with a newer model, visit our Thermostats page here. All of our current thermostat models can replace pre-existing models, the best match for the MatComfort NTG thermostat based on functionality is the HOME thermostat. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice.


  • Thermostat programs are not set properly
    Check out programming instructions and re-program the thermostat.

"HI" reading on the screen
  • Cause
    Solution

  • Probe is likely too close or is touching a heating wire inside the mat
    Call your tile setter to: Option 1 - If the thermostat has an Ambient Sensing feature, refer to the programming instructions and switch to Ambient Mode. Option 2 - Remove flooring and reposition probe. Option 3 - Disconnect existing probe and replace with new probe and position properly.

  • Probe is damaged
    Confirm with electrician and have tile installer install new probe under tile

"LO" reading on the screen
  • Cause
    Solution

  • Floor sensing probe is damaged, missing or loose
    Call your electrician to check the floor sensing probe.

  • Thermostat has reached its end of life.

    Discontinued Year: 2008. If you would like to replace your MatComfort NTG thermostat with a newer model, visit our Thermostats page here. All of our current thermostat models can replace pre-existing models, the best match for the MatComfort NTG thermostat based on functionality is the HOME thermostat. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice.


Floor heats but GFCI light turns on OCCASIONALLY
  • Cause
    Solution

  • Thermostat has reached its end of life and needs to be replaced.

    Discontinued Year: 2008. If you would like to replace your MatComfort NTG thermostat with a newer model, visit our Thermostats page here. All of our current thermostat models can replace pre-existing models, the best match for the MatComfort NTG thermostat based on functionality is the HOME thermostat. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice.


GFCI light is on
  • Cause
    Solution

  • Unit needs to be reset

  • Nuheat system has been damaged.
    If the mat is damaged and you know where the break is; your electrician can make the repair using a Nuheat Mat Repair Kit that is ordered from your local Nuheat dealer. If it is not known where the break is, please fill out the Repair Request Form here

  • Thermostat has reached its end of life and needs to be replaced.

    Discontinued Year: 2008. If you would like to replace your MatComfort NTG thermostat with a newer model, visit our Thermostats page here. All of our current thermostat models can replace pre-existing models, the best match for the MatComfort NTG thermostat based on functionality is the HOME thermostat. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice.


Programmable thermostat screen is blank
  • Cause
    Solution

  • Programmable thermostat is not turned on.
    Open left hand door. Turn On/Standby switch to ON.

  • No voltage to programmable thermostat.
    Call your electrician to turn breaker on.

  • Thermostat has reached its end of life.

    Discontinued Year: 2008. If you would like to replace your MatComfort NTG thermostat with a newer model, visit our Thermostats page here. All of our current thermostat models can replace pre-existing models, the best match for the MatComfort NTG thermostat based on functionality is the HOME thermostat. Click here for the Where to Buy tool. The thermostat should be installed by a certified electrician of your choice.


Mats do not heat up
  • Cause
    Solution

  • Bad connection in junction box
    Call your electrician.

  • No voltage to control
    Call your electrician.

  • No voltage out of control
    See troubleshooting section for thermostats.

  • Probe placed directly on heating wire
    Call your tile setter to reposition probe between two runs of heating wire on the mat. Alternatively, if the thermostat has an ambient sensing feature, refer to the programming instructions and switch to Ambient Mode.

  • Mat wire is damaged
    If the mat wire is damaged a repair is possible with a Nuheat repair kit. Please fill out the Nuheat Repair Request Form

Floor does not heat up
  • Cause
    Solution

  • Bad connection in junction box
    Call your electrician.

  • No voltage to control
    Call your electrician.

  • No voltage out of control
    See troubleshooting section for thermostats.

  • Probe placed directly on heating cable
    Call your tile setter to reposition probe between two runs of heating cable. Alternatively, if the thermostat has an ambient sensing feature, refer to the programming instructions and switch to Ambient Mode.

  • Cable is damaged
    If the cable is damaged a repair is possible with a Nuheat repair kit. Please fill out the Nuheat Repair Request Form