Ideal
Fan or Flue Resonance / Airflow Issue
Boiler very noisy fan or whistling noise from flue during operation
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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, Flue terminal obstruction, Incorrect flue installation, Loose flue joints causing whistling
How to Fix / Troubleshooting
Safety first: Fan and flue are combustion components; only a Gas Safe engineer may dismantle them.
User checks:
- Inspect flue terminal: From outside, check for obstructions (leaves, nests, snow). Clear gently if safe to do so.
- Secure flue brackets: If accessible, ensure external flue brackets are secure and not vibrating.
If noise persists or worsens, an engineer should inspect the fan assembly and flue system and replace the fan if necessary.
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Repair Difficulty
Hard
4/5
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