Junkers
Worn or unbalanced fan
Boiler fan is very noisy 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, Debris in fan impeller, Loose mounting screws, Resonance with flue system
How to Fix / Troubleshooting
Safety: Isolate power and gas before removing the combustion cover.
- External check: Confirm that the noise is from the boiler and not from pipework or radiators.
- Technician tasks:
- Inspect the fan impeller for dirt or foreign objects and clean carefully.
- Check fan mounting screws and rubber mounts; tighten or replace as needed.
- Replace the fan assembly if bearings are noisy or there is excessive play.
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Repair Difficulty
Hard
4/5
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