Problem
The outdoor AC compressor produces a knocking sound while running.
Possible Causes
Loose internal compressor parts
Refrigerant imbalance
Compressor wear
Debris inside the unit
How To Fix It
Turn off the AC system
Inspect the outdoor unit for debris
Check that the unit is level
Restart the system to monitor noise
When To Call A Professional
A knocking compressor often indicates internal damage and should be inspected by an HVAC technician.
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