How do you check a ptac unit compressor?

To check a PTAC unit compressor, first ensure the unit is powered off and unplugged for safety. Inspect the compressor for any visible signs of damage, such as corrosion or leaks. Use a multimeter to measure the electrical resistance of the compressor windings; a reading outside the manufacturer's specifications indicates a potential issue. Finally, check the capacitor for any bulges or leaks, and ensure it is functioning correctly, as a faulty capacitor can prevent the compressor from starting.