Ducane Delayed Ignition / Burner Light-Off Problem

Furnace makes loud banging or booming noise at startup

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

Dirty burners on Ducane burner rack, Misaligned or weak hot surface ignitor, Incorrect gas pressure, Partially blocked heat exchanger

Safety first: Turn off power and gas immediately. Delayed ignition can damage the furnace and pose a safety risk.

Step 1 – Do not continue to operate: Repeated booming can crack the heat exchanger.
Step 2 – Visual burner check: With gas off, remove burner access panel and inspect burners for rust, debris, or misalignment.
Step 3 – Call a professional: Burner removal and cleaning, gas pressure adjustment, and ignition alignment should be performed by a licensed HVAC technician.

Professional Required 5/5

Burner Assembly

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