- Heating or cooling system will not turn off or on.
- The temperature reading is incorrect.
- Recent spike in your energy bill.
- Frequent temperature fluctuations.
- Thermostat is 10 years old or older.
How do I test my thermostat?
- Step 1: Turn off HVAC power. This can be done by switching the furnace to the off position if your system has an on/off switch. ...
- Step 2: Remove thermostat cover. ...
- Step 3: Remove wires from terminals. ...
- Step 4: Turn the HVAC power back on. ...
- Step 5: Test other wires.
What are signs of a bad thermostat?
- #1 – Temperature Gauge Reading Higher (or Lower) Than Normal.
- #2 – Sudden Air Temperature Changes Inside Vehicle.
- #3 – Coolant Leaking.
- #4 – Rumbling Noises.
- #5 – Heater Malfunction.