What should I do if my thermostat screen is blinking or no longer displaying anything?

If your thermostat screen turns off completely, lights up intermittently, or shows no display (black screen), there are several possible causes. Follow the steps below to identify the source of the problem.

1. Check the circuit breaker

Make sure the circuit breaker connected to the thermostat and the heating device is properly switched on.

A tripped circuit breaker cuts power to the thermostat, causing the screen to go completely dark.

2. Check if the heating device is obstructed

If the screen turns off or blinks, it is possible that the thermal protection of the heating device has been activated.

This protection triggers when:

• The baseboard overheats
• An object blocks air circulation (curtain, furniture, etc.)
• The device does not dissipate heat properly

In this case, the power supply to the baseboard and thermostat may be cut off as a safety measure to prevent any fire risk.

Make sure nothing is obstructing your heating device and that it is properly installed (some baseboards distribute heat less effectively if they are not firmly against the wall).

3. Check the capacity of your heating system

Depending on:

• The power of the heating system
• The size of the room
• The outside temperature

It is possible that the device runs continuously without reaching the set temperature. This situation can cause overheating and trigger the thermal protection.

4. Test the thermostat

If possible, swap your thermostat with another working thermostat.

This will help you determine if:

• The problem is localized to the thermostat
• Or if it comes from the heating device or the electrical installation

If the problem persists after the swap, it is likely related to the heating system or wiring. Otherwise, the thermostat may be the cause.

5. Contact a professional

If:

• The circuit breaker is functional
• The device is not obstructed
• The problem persists

Contact an electrician to 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