Compressor won't run. How do I test capacitor, relay on compressor, and overload.
The capacitor test would be to check resistance and the resistance should fall as it is tested. The overload and relay, you will want to check to see if there is power getting to the overload and relay by checking across the wires for 120 vac. If there is 120 vac then you can pull the overload relay from the unit and test from the back side of the relay right pin to see if there is 120 vac from there to the overload pin hole. If there is voltage then the overload and relay are good no voltage they are bad. The most common thing to fail would either be the relay or the main control board.