Your thermostat is the brain of your HVAC system. It controls the system and tells it what to do. When your thermostat stops working, your system won’t know how to control the temperature in your house.
Here a few steps to fix your thermostat:
Check the Battery
See if the battery is no longer working and if so, change it.
Check if a Fuse Has Blown
Replacing a fuse is quick and easy!
Check the Circuit Breaker
If the breaker is tripped, you just need to slip the switch back to on.
Remove Dust From the Thermostat
Dust can get into your thermostat, carefully clean it out to fix the issue.
Location of Thermostat
If the thermostat is having sunlight hit it every day, it could read the temperature in the room wrong. move it to a place where it is out of the sunlight.