Fujitsu
Outdoor Mechanical or Electrical Noise
Loud buzzing, humming, or rattling noise from the outdoor unit
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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 guard or panel screws, Worn outdoor fan motor bearings, Vibrating refrigerant piping, Noisy compressor mounting or failing compressor
How to Fix / Troubleshooting
Safety first: Turn off power at the outdoor disconnect before touching the unit. Keep hands away from the fan blades.
- Tighten panels: Check and tighten all accessible screws on the top cover, side panels, and fan guard.
- Check fan blade: Inspect the fan blade for cracks or looseness on the motor shaft. Tighten the hub screw if loose; replace the blade if cracked.
- Pipe supports: Ensure refrigerant pipes are not vibrating against the unit or wall. Add foam or clamps as needed.
- Compressor noise: A loud metallic knocking or grinding from the compressor often indicates internal damage. This requires a technician and likely compressor replacement.
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Repair Difficulty
Medium
3/5
Required Part
Outdoor Fan Blade
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