Furnace makes loud booming or delayed ignition noise when burners light.
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Booming ignition can damage the furnace. Shut it off and do not continue to operate until inspected.
- Visual burner check: With power and gas OFF, remove the burner assembly and inspect for rust, debris, or spider webs in the burner tubes and crossover channels.
- Clean burners: Use a soft brush and compressed air to clean burner ports. Do not enlarge the ports.
- Check ignitor alignment: Ensure the hot surface ignitor is positioned correctly relative to the burner per the installation manual.
Gas pressure and combustion must be checked by a licensed technician. Do not attempt to adjust gas valve settings yourself.
Repair Difficulty
Required Part
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