1 turn the power off to the heating system.
Central heating room thermostat not working.
If your room thermostat is set below 21 degrees it may stop your heating from turning on altogether.
Cold this means your thermostat is cooling correctly but the heating isn t working properly.
Is your thermostat in the wrong place.
Central heating problems can often be down to a broken thermostat that won t work.
The thermostat detects the temperature of the room and compares it to the desired temperature setting.
Crank it right up and see if your boiler starts working again.
2 remove the thermostat s cover.
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.
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.
Continue to the thermostat wiring section.
If the room is too warm or too cold the thermostat requests heat or air depending on the season.
Thermostat does not control temperature.
Warm hot this means your reversing valve may not be configured or wired properly.
Another reason why your thermostat may not be working properly is if it s been installed in a problematic location.