Vaillant
Combustion or Mechanical Vibration
Boiler makes 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
Fan bearings worn, Burner incorrectly seated, Gas valve pressure set incorrectly, Loose casing panels or mounting brackets
How to Fix / Troubleshooting
Safety: If noise is accompanied by burning smell or signs of overheating, turn off power and gas.
User checks:
- Ensure the boiler casing is properly fitted and all screws are tight.
- Check that pipework is clipped and not vibrating against walls.
Professional checks:
- Inspect and replace the fan assembly if noisy or worn.
- Check burner alignment and condition.
- Verify gas valve settings and combustion with a flue gas analyser.
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Repair Difficulty
Medium
3/5
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