Fraser-Johnston Combustion or Duct Resonance Noise

Furnace is very loud with rumbling or roaring noise during operation.

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

Loose burner assembly, Incorrect gas pressure, Flexible duct booming, Loose sheet metal panels

Safety first: Turn off power and gas before tightening burner components.

Tighten panels: Ensure all furnace access panels are secured with screws. Loose panels can vibrate and amplify noise.
Inspect burners: Check that the burner rack is firmly mounted and not vibrating.
Check ductwork: Look for oil‑canning (popping) in thin metal ducts. Adding bracing or insulation may help.
Professional combustion check: A technician should verify gas pressure and combustion to rule out unsafe operation.

Medium 3/5

Burner Assembly

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