Triangle Tube
Combustion Fan Bearing or Airflow Noise
Boiler runs but makes a high-pitched whine from the fan area
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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 wheel, Resonance in vent piping, Fan speed control issues
How to Fix / Troubleshooting
Safety: Turn off power before removing fan covers.
- Step 1 – Inspect fan wheel: Remove the fan access cover on the Triangle Tube boiler and check for debris or damage to the fan blades. Clean gently.
- Step 2 – Check vent supports: Ensure vent piping is properly supported and not vibrating against framing.
- Step 3 – Test operation: Restore power and listen. If the whine persists and seems to come from the fan motor itself, bearings may be failing.
- Professional replacement: A technician should replace the combustion fan assembly and verify combustion settings.
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Repair Difficulty
Hard
4/5
Required Part
Combustion Fan Assembly
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