Disconnect the outdoor unit cable, check the indoor fan is operating normally; in the cooling operation state, press relay, a stable 220V output, indicating that the outdoor unit is faulty. Open outdoor unit masks, see the press cable is squeezed into the gap sheet metal parts, due to vibration of the press operation, the wire jacket is worn, causing the earth leakage, change the line after all the normal operation of the machine.Ykbservice manual download site