1 turn the power off to the heating system.
Central heating room thermostat not working.
Continue to the thermostat wiring section.
Thermostat does not control temperature.
Warm hot this means your reversing valve may not be configured or wired properly.
2 remove the thermostat s cover.
There are various reasons this could be the case including if the machine is not properly adjusted.
Central heating problems can often be down to a broken thermostat that won t work.
Heating thermostats work by monitoring the average temperature of your home and sending a signal to a boiler to ensure it s never too hot or too cold.
When your thermostat says one temperature and you know the room is another it may be dirty tilted on the wall or located where it can t get a proper reading.
Is your thermostat in the wrong place.
Cold this means your thermostat is cooling correctly but the heating isn t working properly.
Another reason why your thermostat may not be working properly is if it s been installed in a problematic location.
A central heating thermostat is a set of controls used to regulate the output of your heating system to make sure a comfortable temperature is maintained.
If your room thermostat is set below 21 degrees it may stop your heating from turning on altogether.
Crank it right up and see if your boiler starts working again.