Baxi Mechanical Vibration / Imbalanced Fan

Furnace vibrates excessively or causes rattling in the flue or casing

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 fan bearings, Debris on fan impeller, Loose mounting screws on fan or casing, Flue not properly supported

Safety: Isolate power before touching the appliance or flue.

Tighten fixings: Check and tighten screws on the Baxi casing, mounting brackets, and flue supports.
Inspect fan: Remove the combustion cover and inspect the fan impeller for debris or damage. Clean carefully.
Check flue alignment: Ensure the flue is correctly seated in the boiler collar and supported to prevent movement.
Replace fan if worn: If the fan shaft has play or makes grinding noises, the fan assembly should be replaced.

Hard 4/5

Combustion Fan Assembly

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