Armstrong Air
Mechanical Noise from Condenser Fan or Compressor
Outdoor unit makes loud grinding or squealing 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
Worn condenser fan motor bearings, Loose fan blade on shaft, Failing compressor, Debris caught in fan
How to Fix / Troubleshooting
Safety first: Turn off power at the disconnect. Do not insert hands near the fan blades with power on.
Steps:
- 1. Inspect fan area: Remove the top grille and check for sticks, leaves, or other debris rubbing the fan blade.
- 2. Check fan blade: Ensure the blade is tight on the motor shaft and not bent. Tighten the set screw if loose.
- 3. Spin motor by hand: With power off, spin the fan motor. Roughness or grinding indicates bad bearings—replace the motor.
- 4. Isolate compressor noise: If noise persists with the fan disconnected (technician only), the compressor may be failing internally.
- 5. Do not ignore loud mechanical noises: Continued operation can lead to catastrophic failure. Have a technician inspect promptly.
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Repair Difficulty
Medium
3/5
Required Part
Condenser Fan Motor
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