Coleman
Delayed Ignition or Burner Light-Off Problem
Furnace makes loud banging or booming noise at startup.
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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 burners causing delayed flame spread, Incorrect gas pressure, Misaligned burner orifices, Cracked heat exchanger causing abnormal airflow around burners
How to Fix / Troubleshooting
Safety first: Turn off power and gas before removing burner assembly. Delayed ignition can be hazardous.
Steps to check:
- Clean burners: Remove the burner rack from the Coleman furnace. Brush off rust and debris, and blow out burner ports with compressed air (wear eye protection). Ensure crossover channels are clear.
- Inspect burner alignment: Confirm burners are seated properly on the manifold and aligned with the orifices.
- Professional gas check: Have a technician verify manifold gas pressure and inspect the heat exchanger for cracks or distortion.
Do not continue operating a furnace with loud booms at startup; have it inspected by a licensed HVAC professional.
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Repair Difficulty
Hard
4/5
Required Part
Burner Assembly
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