Bosch
Outdoor Mechanical Noise / Fan or Compressor Issue
Loud humming or grinding 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
Worn outdoor fan motor bearings, Fan blade hitting shroud, Loose compressor mounting bolts, Failing compressor
How to Fix / Troubleshooting
Safety first: Turn off power at the outdoor isolator before inspecting.
Steps:
- Inspect fan blade: Check that the Bosch outdoor fan blade is not cracked and does not contact the grille or shroud. Straighten or replace if damaged.
- Check mounting: Ensure the outdoor unit is firmly fixed to its base and that anti-vibration pads are intact.
- Listen after restart: Restore power and briefly run the unit to identify whether the noise is from the fan or compressor (do not touch moving parts).
Resolution: Noisy fan motors or compressors generally require replacement by a Bosch technician.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Condenser Fan Motor
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