Heating System Basic Troubleshooting

What To Do First if your Heating System is Not Running

  1. Check your Thermostat. Make sure the control is set to Heating mode. Make sure your set temperature is warmer than the current indoor temperature.
  2. Ensure that your furnace’s or air handler’s power is on. Try turning the fan to ON using the fan switch on the control or thermostat to test for power to the furnace.
  3. Make sure all circuits on your electrical panel or circuit breaker are in the ON position.

Check the furnace power switch to be sure it’s in the ON position (it looks like a light switch on a gray box located at the furnace).

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