Mini split starts up after time delay and runs for only a few seconds before shutting down with a 5 flash at indoor unit. 5 flash according to mylinkdrive troubleshooting refers to outdoor power system. Indoor unit manual reports that condition causes compressor to stop for overcurrent protection or start up failure protection. As tech saw outdoor unit shut down, tech gets a 2 red flash at outdoor unit control board. Tech also found a wire rub on the white wire leading to compressor. Tech repaired wire rub with wire nut. Compressor ohms fine with fieldpiece meter, but pressure tap pressure does not change when outdoor fan starts. Compressor is not starting. Tech got DC line voltage on white and red lead on one occasion. Tech got no voltage on each subsequent try. Tech suspects faulty outdoor unit control board due to wire rub. Tech recommends ordering outdoor unit board and also installing a surge protector. Outdoor unit serial number is correct in ServiceTitan (last four are 2875). C