Napoleon
Blower or Inducer Mechanical Noise
Furnace produces a high-pitched whine or loud humming 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 blower motor bearings, Debris in blower wheel, Failing inducer motor bearings, Loose mounting hardware
How to Fix / Troubleshooting
Safety first: Turn off power before touching moving parts.
- Identify source: Remove the blower door and carefully listen to determine if the noise is from the main blower or the inducer.
- Inspect blower wheel: Check for debris (insulation, screws, etc.) in the blower wheel. Remove any obstructions and ensure the wheel is centered and tight on the shaft.
- Check mounting: Tighten all screws securing the blower housing and inducer assembly to the furnace cabinet.
- Motor bearings: If the noise is a grinding or squealing that changes with speed, the motor bearings are likely worn. Replace the blower or inducer motor assembly as appropriate.
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Repair Difficulty
Medium
3/5
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