Napoleon
Delayed Ignition / 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, Misaligned burners or crossover ports, Low primary air, Incorrect gas pressure
How to Fix / Troubleshooting
Safety first: Turn off power and gas. Delayed ignition can damage the furnace and is a combustion safety issue.
- Inspect burners: Remove the burner assembly. Clean each burner with a soft brush and compressed air, paying special attention to crossover ports between burners.
- Check alignment: Ensure burners are properly seated and aligned with the ignitor and flame sensor when reinstalling.
- Do not adjust gas pressure yourself: Gas pressure and combustion air adjustments must be done by a licensed technician using proper instruments.
- Professional evaluation: If banging persists after cleaning, have a technician check gas pressure, combustion, and heat exchanger condition.
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Repair Difficulty
Professional Required
5/5
Required Part
Burner Assembly
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