Comfortmaker
Flame Sensing Failure
The burners light but go out after a few seconds; the furnace repeatedly tries to restart.
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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 rod, Poor burner ground connection, Flame not properly contacting the sensor due to a misaligned burner, Low gas pressure on the Comfortmaker manifold
How to Fix / Troubleshooting
Safety: Turn off power and gas before removing the flame sensor or burner assembly.
Steps:
- Clean flame sensor: Remove the flame sensor and gently polish its rod with fine steel wool. Wipe with a clean, dry cloth and reinstall.
- Check sensor placement: Ensure the sensor rod is fully in the burner flame path when reinstalled.
- Inspect ground: Tighten any loose screws securing the burner rack to the furnace chassis. Confirm that the green ground wire from the control board is secure.
- Observe flame: After cleaning, watch the burners. The flame should be steady and blue, touching the sensor.
When to call a technician: If the problem persists, gas pressure, burner alignment, or the control board flame circuit may require professional evaluation.
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Repair Difficulty
Medium
3/5
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