Thermona
Fan Mechanical Wear / Flue Resonance
Boiler fan is very noisy, with whistling or grinding sounds 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 bearings in Thermona fan, Debris in fan impeller, Loose flue joints causing resonance, Incorrect flue length or support
How to Fix / Troubleshooting
Safety: Fan and flue components are part of the combustion circuit. Only qualified personnel should dismantle them.
- Check flue supports: Ensure the external flue is properly supported and not vibrating against walls or brackets.
- Listen for bearing noise: A grinding or rumbling noise from the fan area usually indicates worn bearings and the need for fan replacement.
- Engineer replacement: A Thermona technician should remove and replace the fan assembly, check the venturi and seals, and verify combustion with a flue gas analyser.
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Repair Difficulty
Hard
4/5
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