Why Is My Furnace Blowing Cold Air?
A furnace blowing cold air in winter defeats its purpose. The cause can be the thermostat, the pilot or ignition, or a safety switch.
Common Causes
- The thermostat is set to fan-only or the fan is set to on instead of auto.
- The pilot light or ignition system failed.
- A dirty flame sensor.
- A tripped safety limit switch from overheating.
What to Check
Check the thermostat fan setting first. If that is correct, the cause is likely the ignition or flame sensor. See furnace blowing cold air and furnace repair.
FAQs
Why is my furnace blowing cold air?
Check the thermostat fan setting. If correct, the cause may be the ignition system, a dirty flame sensor, or a tripped safety switch.
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