Heil
Blower Running Without Proper Burner Operation
Furnace cycles on and off with blower running but produces cool or only slightly warm air.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open gas valve, Failed ignitor, Flame sensor shutting down burners, Limit switch cycling and forcing fan-only mode
How to Fix / Troubleshooting
Safety: Turn off power and gas before inspecting burners or ignition.
Steps to check:
- Observe burners: Through the sight glass, confirm whether burners are lighting and staying lit. If not, check for an error code.
- Filter and airflow: Replace dirty filters to prevent limit trips that can shut burners off.
- Clean flame sensor: If burners light but go out quickly, clean the flame sensor.
When to call a pro: If burners never light or go out repeatedly, a technician should test the ignitor, gas valve, and safety circuits.
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Repair Difficulty
Medium
3/5
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