Upon my arrival, customer was concerned thermostat was showing code 83–56 and unit not coming on. Upon my diagnosis I found the code was due to an overcurrent on the refrigerant pumping system side. Found the wiring harness to be charred and very loose on terminals of compressor. Cannot check compressor current until wiring harness is replaced. Will be in contact with customer tomorrow about repair price and part availability when supply store opens in the morning.