Sign #1: Your thermostat has no power or is unresponsive
If there’s no change in your home’s temperature when you adjust the temperature, or the display is unlit or unresponsive, your thermostat may be broken or the batteries need replacing.
Sign #2: Your heater or A/C won’t turn ON
Is your heater or A/C not turning on? It could be a wiring defect in the thermostat the prevents electrical signals to be sent to your cooling/heating system.
Sign #3: Your A/C or heater runs constantly and won’t turn OFF
If your heating/cooling system runs constantly and won’t turn off, it could be that the wiring is frayed or that the thermostat is miscalibrated.
Sign #4: Room temperature and setting don’t match
A more subtle sign of a broken thermostat is when room temperatures don’t match. Now if your home is zoned, then temperature differences between rooms is normal. But if your home hasn’t been zoned, fluctuating temperatures in different parts of the house could point to a faulty thermostat.
