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Issue Cause Solution
Programmable thermostat screen is blank No voltage to programmable thermostat.
Faulty thermostat.
Call your electrician to turn breaker on.
Call Nuheat at 1‐800‐778‐9276.
GFCI light is on Unit needs to be reset
Nuheat system has been damaged.
Programmable thermostat has a defective GFCI that is oversensitive
Follow these instructions.
Call your electrician to perform insulation and resistance tests as per installation instructions. If system is damaged, call Nuheat at 1‐800‐778‐9276
Call Nuheat at 1‐800‐778‐9276.
Floor heats but GFCI light turns on OCCASIONALLY Programmable thermostat has a defective GFCI that is oversensitive.
Halogen lights installed causing electrical noise to trip programmable thermostat.
Call Nuheat at 1‐800‐778‐9276.
Call Nuheat at 1‐800‐778‐9276.
Programmable thermostat won't hold a program Faulty thermostat.
Thermostat programs are not set properly
Call Nuheat at 1‐800‐778‐9276.
Check out programming instructionsand 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 instructionsand 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).
Faulty thermostat.
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
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
“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.