nvent NUHEAT SIGNATURE User manual

nVent NUHEAT "SIGNATURE" Thermostat - SKU AC0055
THE SCREEN IS BLANK - TROUBLESHOOTING STEPS
Please try the following solutions for the listed causes.
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, 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.
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.