1 a. MALFUNCTION CODESMalfunction Description and MeasuresCodeA5 IDU Antifreeze - Low Evaporator Temperature AlarmAS Indoor Unit power supply voltage abnormalC4 Indoor heat exchanger liquid pipe tempearture sensor malfunctionC9 Indoor Suction air thermistor malfunctionE3 High pressure malfunction (Outdoor unit)E4 Low pressure malfunction (Outdoor unit)E5 High pressure difference Alarm (Outdoor unit)Compressor envelope protection (Outdoor unit)E6High condensing temperature alarm (Outdoor unit)F3 Discharge piping temperature protection (Outdoor Unit)H9 Outdoor air thermistor system malfunction (Outdoor Unit)J3 Discharge piping temperature malfunction (Outdoor Unit)J5 Suction piping thermistor system malfunction (Outdoor Unit)J6 Heat exchanger thermistor malfunction (Outdoor Unit)L2 Compressor drive fault (Outdoor unit)L4 Overheated heat-radiating fin (Outdoor unit)L5 Instantaneous DC overcurrent (Outdoor unit)LC Compressor drive communication fault (Outdoor unit)P1 Power Voltage Imbalance (Outdoor unit)PJ Capacity setting failure (Outdoor unit)U1 Reverse phase (Outdoor unit)U4 Transmission error (between indoor and outdoor unit)U5 Transmission error (between indoor unit and remote controller)If the fault persists, please call your local dealer /serviceman.25