IVT
Blower or combustion fan bearing noise
Furnace produces a high-pitched whine or squeal 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 circulation blower bearings, Failing combustion fan motor, Loose fan wheel on shaft, Airflow resonance in ductwork
How to Fix / Troubleshooting
Safety: Turn off power before accessing fans.
- Identify source: Remove the blower door and briefly run the furnace (if allowed by the door switch) to determine whether the noise comes from the circulation blower or combustion fan.
- Inspect blower wheel: Check for rubbing against the housing or loose set screws. Tighten as needed.
- Check for debris: Remove any foreign objects from the blower or combustion fan area.
- Plan for replacement: If bearings are noisy or there is noticeable shaft play, schedule replacement of the affected fan assembly.
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Repair Difficulty
Medium
3/5
Required Part
IVT circulation blower motor
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