ATAG Combustion or Fan Noise

Furnace is very noisy during operation (whistling, roaring, or droning)

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

Worn combustion fan bearings, Resonance in flue system, Incorrect gas/air ratio, Loose burner or casing panels

Safety first: Isolate power and gas before removing covers.

Check that all casing screws and panels are tight to reduce vibration.
Inspect the flue for correct support and alignment; adjust brackets to prevent resonance.
Spin the fan by hand; roughness or play indicates bearing wear and the fan should be replaced.
Combustion noise due to gas/air ratio must be corrected by a certified technician using a flue gas analyser.

Hard 4/5

ATAG combustion fan

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