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Why is my thermostat not working?

Reasons why a thermostat stops working and how to troubleshoot

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Confirming Your Thermostat Isn’t Working

The majority of boilers have their heating schedule and temperature controlled by a thermostat, with many people now installing a smart thermostat to help boost their boiler system’s efficiency and usability in regards to the controls. You will know if the thermostat you’re using is unresponsive to the boiler itself by seeing if the boiler responds to the thermostat when you change the temperature. If the radiators at your property are on a high heat when the thermostat is set to a low temperature then you know the thermostat and boiler aren’t communicating as they should. On the other hand if the radiators are cold when the thermostat is set to a high temperature, again you know there is an issue with the thermostat and boiler’s communication. Luckily this is normally one of the easier boiler problems to troubleshoot and solve.

Steps to troubleshooting you thermostat:

Check the batteries

First we recommend checking the batteries of your thermostat if it is wireless, then altering the temperature on the thermostat to see if the boiler responds by examining the radiators to see if they heat up. The radiators should become either hotter or colder depending on the temperature set on the thermostat.

Check the connectivity

If the problem is still occurring we would then recommend moving the thermostat closer to your boiler and double checking that the thermostat is connected to the wifi if you’re using a smart thermostat. Once the thermostat has been moved closer to the boiler and is connected to the wifi (if necessary), you can see if the boiler is responding to the thermostat by repeating the same process above of inspecting the radiators on your property.

Check the settings and set up

The final check to make would be ensuring that the thermostat is set up correctly to make certain it is connected to the boiler properly, and the time-settings are in line with the actual time of your region. Sometimes there may have been a mistake in the set-up process preventing the boiler and thermostat properly connecting, or if the time settings aren’t correct it could result in a delayed response from the boiler. To double check this isn’t the case you should find a copy of your user manual, or find a digital version and run through the set-up process again to ensure it’s all done correctly.

Check with the manufacturer

In the event that your boiler is still not responding to your thermostat after trying all these solutions you should contact the manufacturer of your thermostat, to see if the thermostat is faulty or not set up correctly. If this isn’t the case and the problem is still ongoing even after following the manufacturer’s instructions, then you should contact an engineer to diagnose the problem as it may be that the boiler itself is faulty. To organise an appointment with an engineer feel free to contact us on our 24/7 customer service helpline (0207 9989 005).

If your heating isn’t working but your hot water is and you’re unsure whether it is the thermostat causing the problem, you may want to check out our article on hot water but no heating.