Trouble​shooting

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Please click here to visit our Nuheat YouTube channel to access installation videos for our SIGNATURE, HOME and element thermostats.

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

  • 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 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 multimeterIf the system tests by the electrican/installer show no ground fault, please contact Nuheat Customer Care at 1-800-778-WARM (9276).

    If the red light on your unit is located on the RIGHT side of the thermostat and the red light does not turn off, reset the circuit breaker. If problem continues to persist, please contact Nuheat Customer Care at 1-800-778-WARM (9276).

    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 multimeterIf the system tests by the electrican/installer show no ground fault, please contact Nuheat Customer Care at 1-800-778-WARM (9276).

The screen is blank
  • Cause
    Solution

  • 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 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.

  • It is a defective faceplate.
    If there is power to the unit and attempts to turn the unit on has been unsuccessful, please contact Nuheat Customer Care at 1-800-778-WARM (9276). After verification, a replacement faceplate ​can be sent out with instructions on how to replace the faceplate. An electrician is NOT required to install the new faceplate when received.

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.

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. 

    If the screen remains unresponsive after calibration, please contact Nuheat Customer Care at 1-800-778-WARM (9276).

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. 

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

  • 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 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 multimeterIf the system tests by the electrican/installer show no ground fault, please contact Nuheat Customer Care at 1-800-778-WARM (9276).

    If the red light on your unit is located on the RIGHT side of the thermostat and the red light does not turn off, reset the circuit breaker. If problem continues to persist, please contact Nuheat Customer Care at 1-800-778-WARM (9276).

    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 multimeterIf the system tests by the electrican/installer show no ground fault, please contact Nuheat Customer Care at 1-800-778-WARM (9276).


The screen is blank/black.
  • Cause
    Solution

  • 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 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.

  • It is a defective faceplate.
    If there is power to the unit and attempts to turn the unit on has been unsuccessful, please contact Nuheat Customer Care at 1-800-778-WARM (9276). After verification, a replacement faceplate can be sent out with instructions on how to replace the faceplate. An electrician is NOT required to install the new faceplate when received.

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. 

    If the screen remains unresponsive after calibration, please contact Nuheat Customer Care at 1-800-778-WARM (9276).
     

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.


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, 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
    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.

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. Call Nuheat at 1-800-778-9276 for help.

"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. Call Nuheat at 1-800-778-9276 for help.

"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.
    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.
    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 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. Call Nuheat at 1-800-778-9276 for help.
    Check out programming instructions and re-program the thermostat. Call Nuheat at 1-800-778-9276 for help.

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 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

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, call Nuheat at 1-800-778-9276 for assistance.

  • Halogen lights installed or other electrical noicse is causing it to trip or the system was not installed on a dedicated non-GFCI circuit
    Call Nuheat at 1-800-778-9276.

  • 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 have them call Nuheat for correct information

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.
    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.
    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

  • Programmable thermostat has a defective GFCI that is oversensitive.
    Call Nuheat at 1-800-778-9276.

  • Halogen lights installed causing electrical noise to trip programmable thermostat.
    Call Nuheat at 1-800-778-9276.

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, call Nuheat at 1-800-778-9276

  • Programmable thermostat has a defective GFCI that is oversensitive
    Call Nuheat at 1-800-778-9276.

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 Nuheat at 1-800-778-9276.

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. 

"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

  • Programmable thermostat has a defective GFCI that is oversensitive.
    Call Nuheat at 1-800-778-9276.

  • Halogen lights installed causing electrical noise to trip programmable thermostat.
    Call Nuheat at 1-800-778-9276.

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 system is damaged, call Nuheat at 1-800-778-9276

  • It has reached its end of life and needs to be replaced.
    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.
    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.
    Call Nuheat at 1-800-778-9276.

  • 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.
    Call Nuheat at 1-800-778-9276.

Floor heats but GFCI light turns on OCCASIONALLY
  • Cause
    Solution

  • Thermostat has reached its end of life and needs to be replaced.
    Call Nuheat at 1-800-778-9276.

  • Halogen lights installed causing electrical noise to trip programmable thermostat.
    Call Nuheat at 1-800-778-9276.

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 system is damaged, call Nuheat at 1-800-778-9276

  • Thermostat has reached its end of life and needs to be replaced.
    Call Nuheat at 1-800-778-9276.

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.
    Call Nuheat at 1-800-778-9276.

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