Heil
Flame Sensing / Proving Failure
Furnace burners light but go out after a few seconds; this repeats several times.
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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
Dirty flame sensor, Poor ground connection, Flame not reaching sensor due to dirty burners, Low gas pressure
How to Fix / Troubleshooting
Safety: Turn off power and gas before cleaning components.
Steps to check:
- Clean flame sensor: Remove and polish the sensor rod with fine steel wool. Reinstall securely.
- Check burner cleanliness: Inspect burners for rust and debris; clean with a soft brush if accessible.
- Verify ground: Ensure the furnace ground wire is tight and there is no corrosion at the ground lug.
When to call a pro: If the problem persists, a technician should measure flame signal, adjust gas pressure, and thoroughly clean or replace burners.
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Repair Difficulty
Medium
3/5
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