Outdoor unit makes loud rattling, buzzing, or grinding noises during operation
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Turn off power at the outdoor disconnect before inspecting. Do not put hands near the fan with power on.
Steps to try:
- Inspect fan blade: Check for cracks, loose mounting nut, or contact with the shroud. Tighten the hub nut if loose.
- Remove debris: Clear sticks, stones, or other objects from the fan area.
- Check compressor mounts: Look for broken or collapsed rubber mounts causing the compressor to vibrate against the frame.
- Restart and listen: After reassembly, briefly run the unit and listen from a safe distance.
When to call a pro: Persistent grinding or loud buzzing may indicate a failing motor or compressor that needs professional replacement.
Repair Difficulty
Required Part
We may earn a commission from links on this page.