Potterton
Fan or Pump Acoustic Noise
Boiler runs but makes a high-pitched whine or humming noise
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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 fan bearings, Cavitating pump, Air in system, Resonance in casing or flue
How to Fix / Troubleshooting
Safety first: Do not remove the sealed combustion cover yourself.
User checks:
- Bleed radiators to remove air and top up pressure.
- Note whether the noise occurs during heating, hot water, or both.
Engineer checks:
- Listen to fan and pump individually to identify the source.
- Replace worn fan or pump if bearings are noisy.
- Add or adjust pipe and casing supports to reduce resonance.
Addressing mechanical wear and air in the system will usually reduce noise.
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Repair Difficulty
Medium
3/5
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