Troubleshooting Guide

Floor Heating  |  Freeze Protection


Floor Heating Troubleshooting Guide


Issue Cause Solution
Programmable thermostat screen is blank No voltage to programmable thermostat. Call your electrician to turn breaker on.
  Faulty thermostat. Call Nuheat at 1-800-778-9276.
GFCI light is on Unit needs to be reset Follow these instructions.
  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.
Floor heats but GFCI light turns on OCCASIONALLY 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.
Programmable thermostat won't hold a program Faulty thermostat. Call Nuheat at 1-800-778-9276.
  Thermostat programs are not set properly Check out programming instructions and re-program the thermostat.
Programmable thermostat turns ON before programmed set time 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.
Control showing much higher temperature than set 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.
  Faulty thermostat. Call Nuheat at 1-800-778-9276.
Control shows a cool floor temperature but floor feels warm. Heating indicator bars are showing. 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.
"HI" reading on the screen 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.
"LO" reading on the screen 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.
"Err 01" reading on the screen 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.
"Err 02" reading on the screen 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 03" reading on the screen 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.
"Err 04" reading on the screen 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.
"Err 05" reading on the screen The ambient temperature sensor circuit is open. Call Nuheat at 1-800-778-9276.
"Err 06" reading on the screen The ambient temperature sensor is shorted. Call Nuheat at 1-800-778-9276.
Issue Cause Solution
Programmable thermostat screen is blank No voltage to programmable thermostat. Call your electrician to turn breaker on.
  Faulty thermostat. Call Nuheat at 1-800-778-9276.
Both test and reset lights are ON. Unit needs to be reset Follow these instructions.
  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.
Floor heats but test and reset light turns on OCCASIONALLY 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.
Programmable thermostat won't hold a program Faulty thermostat. Call Nuheat at 1-800-778-9276.
  Thermostat programs are not set properly Check out programming instructions and re-program the thermostat.
Programmable thermostat turns ON before programmed set time 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.
Control showing much higher temperature than set 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.
  Faulty thermostat. Call Nuheat at 1-800-778-9276.
Control shows a cool floor temperature but floor feels warm. Heating indicator bars are showing. 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.
Thermostat is hot. 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.
Wrong temperature is displayed. Verify that the sticker on the thermostat's screen has been removed. Remove the sticker.
Temperature does not change according to the programmed schedule. Thermostat is in Manual mode. Check that the thermostat is in Automatic mode. Refer to programming instructions and check the schedule and clock settings.
Time display is flashing. The thermostat was without power for more than 2 hours. Refer to programming instructions and re-program the thermostat.
The °F or °C does not appear. 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.
Issue Cause Solution
Programmable thermostat screen is blank No voltage to programmable thermostat. Call your electrician to turn breaker on.
  Faulty thermostat. Call Nuheat at 1-800-778-9276.
GFCI light is on Unit needs to be reset Follow these instructions.
  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.
Floor heats but GFCI light turns on OCCASIONALLY 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.
Control showing much higher temperature than set 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.
Control shows a cool floor temperature but floor feels warm. Heating indicator bars are showing. 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.
"LO" reading on the screen The measured temperature is below the thermostat’s display range. Heating is activated. No corrective action is necessary.
"HI" reading on the screen The measured temperature is above the thermostat’s display range. Heating is deactivated. No corrective action is necessary.
"Er" reading on the screen Wiring is done incorrectly. Call your electrician to verify the thermostat and sensor connections.
Issue Cause Solution
Programmable thermostat screen is blank 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.
  Faulty thermostat. Call Nuheat at 1-800-778-9276.
GFCI light is on Unit needs to be reset Follow these instructions.
  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.
Floor heats but GFCI light turns on OCCASIONALLY 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.
"LO" reading on the screen Floor sensing probe is damaged, missing or loose Call your electrician to check the floor sensing probe.
  Faulty thermostat. Call Nuheat at 1-800-778-9276.
"HI" reading on the screen 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
Programmable thermostat won't hold a program Faulty thermostat. Call Nuheat at 1-800-778-9276.
  Thermostat programs are not set properly Check out programming instructions and re-program the thermostat.
Programmable thermostat turns ON before programmed set time 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.
Control showing much higher temperature than set 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.
  Faulty thermostat. Call Nuheat at 1-800-778-9276.
Control shows a cool floor temperature but floor feels warm. Heating indicator bars are showing. 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.
Issue Cause Solution
Mats do not heat up Bad connection in junction box Call your electrician
  No voltage to control Call your electrician
  No voltage out of control Call your electrician to determine if it is a connection issue or thermostat issue. If it is an issue with the thermostat, call Nuheat at 1-800-778-9276
  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 Call your electrician to perform insulation and resistance tests as per cable installation instructions. If cable is damaged, call Nuheat at 1-800-778-9276
  Probe in direct sunlight or under obstruction Call your tile setter to reposition probe away from direct sunlight or under obstruction. Alternatively, if the thermostat has an ambient sensing feature, refer to the programming instructions and switch to Ambient Mode.
Issue Cause Solution
Floor does not heat up Bad connection in junction box Call your electrician
  No voltage to control Call your electrician
  No voltage out of control Call your electrician to determine if it is a connection issue or thermostat issue. If it is an issue with the thermostat, call Nuheat at 1-800-778-9276
  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 Call your electrician to perform insulation and resistance tests as per cable installation instructions. If cable is damaged, call Nuheat at 1-800-778-9276
  Probe in direct sunlight or under obstruction Call your tile setter to reposition probe away from direct sunlight or under obstruction. Alternatively, if the thermostat has an ambient sensing feature, refer to the programming instructions and switch to Ambient Mode.

RETURN TO TOP

Freeze Protection Troubleshooting Guide


RETURN TO TOP

 
Bookmark and Share