Baxi
Resonance / Fan or Burner Vibration
Boiler makes a loud humming or vibrating noise when firing
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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.
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Possible Causes
Worn Baxi fan bearings, Loose mounting brackets or casing panels, Burner instability, Pump cavitation due to air or low pressure
How to Fix / Troubleshooting
Safety first: Unusual noises can indicate developing mechanical failure.
User checks:
- Check system pressure is correct (1.0–1.5 bar cold).
- Ensure the boiler casing is properly fitted and all screws are secure.
- Note whether the noise occurs only when the fan starts or throughout operation.
Professional actions:
- An engineer will inspect the fan, pump, and burner, tighten fixings, and replace worn components.
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Repair Difficulty
Medium
3/5
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