Dettson
Combustion Fan / Blower Noise
Boiler is very noisy; fan whines or rattles loudly 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 Dettson combustion fan, Loose blower wheel, Debris in fan housing, Misaligned venting causing resonance
How to Fix / Troubleshooting
Safety: Turn off power before touching the fan assembly. Do not insert objects into the fan while it is running.
- Inspect fan housing: Remove the access panel and visually inspect the combustion fan for debris or foreign objects.
- Check mounting: Ensure all fan mounting screws are tight and that the blower wheel is secure on the motor shaft.
- Listen for bearing noise: A high-pitched whine or grinding often indicates failing bearings. The Dettson fan assembly should be replaced as a unit.
- Vent resonance: Verify that vent pipes are properly supported and not vibrating against building structures.
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Repair Difficulty
Medium
3/5
Required Part
Dettson combustion fan assembly
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