Mitsubishi Electric
Indoor Mechanical Noise / Fan Imbalance
Indoor unit makes loud rattling, buzzing, or grinding noises 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
Loose indoor fan wheel, Foreign object in blower, Worn fan motor bearings, Loose panel or mounting bracket
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before opening the unit.
Steps:
- Check for debris: Remove the front panel and filters. Inspect the cross-flow fan for foreign objects (plastic, paper, insects) and remove them.
- Tighten fan wheel: Access the fan wheel set screw on the motor shaft (if accessible) and tighten it carefully.
- Secure panels: Tighten all screws on the indoor casing and mounting plate. Add foam tape where panels vibrate.
- Assess motor bearings: If noise persists and sounds like grinding or squealing, the fan motor bearings may be worn. Replace the indoor fan motor assembly.
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Repair Difficulty
Medium
3/5
Required Part
Indoor Fan Motor / Fan Wheel
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