HVAC Systems · Heating Problems
Cool Air from Furnace
Furnace blowing cool air instead of warm, could indicate problems with the igniter, pilot light, gas supply, or malfunctioning heat exchanger.
Common symptoms
- Cool air when heating called for
- Pilot light out
- No ignition
Common repairs
- Igniter replacement
- Pilot light relighting
- Flame sensor cleaning
- Gas valve testing
Pro launch updates
Get notified when Pro launches, plus a monthly code-change digest. Email only — no account required.