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By Joanna Brown
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Posted 8/1/23

A common furnace repair issue homeowners face in the winter is their furnace not heating. A furnace not heating can be caused by a few different issues. This problem may be corrected by some quick troubleshooting, or may require the assistance of a furnace repair technician.

Troubleshooting a furnace not heating

A furnace not heating may be caused because the thermostat is not telling the furnace to fire up! These troubleshooting steps may help if the thermostat settings are to blame:

If the furnace doesn’t have power, it will not turn on, preventing heating.

If the furnace does not have fuel, it will not create heat.

The furnace may not be heating because the motor has been overloaded, requiring reset.

Issues causing furnace not heating

A faulty pilot light can be the cause of a furnace not heating in an older system. If the pilot light will not stay lit, several issues could be to blame. A furnace repair technician will diagnose the source of the issue and make needed repairs, which could be replacing the thermocouple or safety cutoff valve, cleaning the pilot light’s orifice, or adjusting the flame.

If the flame sensor is dirty, the furnace will not function because it is protecting against burning heating fuel unsafely. The flame sensor may require cleaning or readjustment.