Mitsubishi Electric
Outdoor Mechanical Noise / Vibration
Outdoor unit makes loud humming, rattling, or metallic noises
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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 fan blade or motor, Debris in fan guard, Loose compressor mounting bolts, Unit not level or on unstable base
How to Fix / Troubleshooting
Safety first: Turn off power at the outdoor disconnect before inspection.
Steps:
- Inspect fan area: Remove power and check for sticks, leaves, or other debris in the fan guard. Remove carefully.
- Tighten fan blade: Check that the fan blade is secure on the motor shaft. Tighten the hub nut or set screw if loose.
- Check mounting: Ensure the outdoor unit is firmly bolted to its base or brackets and that rubber pads are intact.
- Compressor mounts: If a metallic knocking sound is heard, inspect compressor mounting bolts and rubber grommets. Replace worn mounts.
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Repair Difficulty
Medium
3/5
Required Part
Outdoor Fan Motor / Fan Blade / Compressor Mounts
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