Problem
The AC unit produces a high pitched noise while running.
Possible Causes
Fan motor issues
Loose internal components
Refrigerant pressure problems
Worn bearings
How To Fix It
Turn off the AC system
Inspect the outdoor unit for debris
Restart the system briefly to identify the noise source
When To Call A Professional
A high pitched noise may indicate a failing motor or compressor and should be inspected by an HVAC technician.