The furnace makes a loud banging or booming noise at startup when the burners ignite.
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: Delayed ignition can damage the heat exchanger and poses a fire hazard. Turn off gas and power before inspecting the burners.
Steps:
- Inspect burners: Remove the burner assembly if accessible. Look for rust, debris, or spider webs in the burner ports. Clean with a soft brush and compressed air.
- Check ignitor position: Ensure the ignitor is positioned so that gas flows directly across the glowing element.
- Reassemble carefully: Make sure the burners are properly seated and aligned with the manifold.
When to call a technician: If booming persists, gas pressure and combustion should be checked by a professional. Do not continue operating with loud ignition bangs.
Repair Difficulty
Required Part
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