CTC
Delayed Ignition / Burner Light-Off Noise
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 ignition, Incorrect gas pressure, Misaligned igniter, Partially blocked heat exchanger
How to Fix / Troubleshooting
Safety first: Turn off power and gas. Booming ignition can damage the furnace and is a safety concern.
Steps:
- Inspect and clean the CTC burner assembly, paying special attention to crossover ports between burners.
- Verify that the hot surface igniter is properly positioned in the gas stream of the first burner.
- Do not attempt to adjust gas pressure yourself; a licensed technician must measure and adjust manifold pressure and inspect the heat exchanger.
- If booming persists after cleaning, discontinue use and have the furnace professionally inspected for heat exchanger and gas train issues.
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Repair Difficulty
Professional Required
5/5
Required Part
CTC Burner Assembly
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