Sinopé thermostat screen blinking or blank: what to do?

If a Sinopé thermostat screen is blinking or blank, first check that the circuit breaker is on, then make sure the heating device is not blocked: overheating triggers the heater’s thermal protection, which also cuts power to the thermostat. If the problem continues, temporarily swap the thermostat with one that works to find out whether the thermostat or the installation is at fault, and have an electrician check the wiring if needed.

Can the circuit breaker turn off my Sinopé thermostat screen?

Yes. If the breaker for the Sinopé thermostat and its heater has tripped, the thermostat has no power and its screen goes completely blank. First make sure that breaker is switched on.

Why does a blocked heating device make my Sinopé thermostat blink or go blank?

When a heating device overheats, its thermal protection trips and cuts power to the device and the Sinopé thermostat to prevent a fire risk. The thermostat screen then blinks or goes blank. This protection is triggered when :

  • the heating device overheats;
  • an object blocks the airflow (curtain, furniture, etc.);
  • the heater does not release heat properly, for example a baseboard not flush against the wall.

Clear the area around the heater and check that it is installed correctly.

Is my heating system powerful enough for the room?

If the heating device is not powerful enough for the room size or the outdoor temperature, it can run constantly without reaching the Sinopé thermostat’s setpoint. It may then overheat and trip its thermal protection, which also shuts off the thermostat.

How can I tell whether the problem is the Sinopé thermostat or the installation?

Temporarily swap the Sinopé thermostat with another thermostat that works. If the problem continues after the swap, the cause is probably the heating system or the wiring. If it goes away, the thermostat is probably at fault.

When should I call a professional?

If the breaker is on, the heater is not blocked and the Sinopé thermostat screen still blinks or goes blank, have an electrician check your installation.


Product models associated with this article : 

  • (Wi-Fi) TH1123WF, TH1124WF, TH1133WF, TH1134WF,TH1133CR, TH1134CR, TH1143WF, TH1144WF, TH1300WF, TH1310WF, TH1400WF, TH1500WF
  • (Zigbee) TH1123ZB, TH1124ZB, TH1134ZB/HC, TH1300ZB, TH1400ZB, TH1500ZB
  • (Others) TH1120RF, TH1121RF, TH1300RF, TH1500RF, TH1120P, TH1120, TH1124NP

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