SiBE041134 TroubleshootingService Diagnosis 654. Troubleshooting4.1 Error Codes and Description+: Displayed only when system-down occurs.Error Codes Description ReferencePageSystem 00 Normal —U0+ Refrigerant shortage 73U2 Low-voltage detection or over-voltage detection 75U4 Signal transmission error (between indoor unit and outdoor unit) 77UA Unspecified voltage (between indoor unit and outdoor unit) 79IndoorUnit A1 Indoor unit PCB abnormality 66A5 Freeze-up protection control or heating peak-cut control 68A6 Fan motor (DC motor) or related abnormality 70C4 Indoor heat exchanger thermistor or related abnormality 72C9 Room temperature thermistor or related abnormality 72OutdoorUnit E1 Outdoor unit PCB abnormality 80E5+ OL activation (compressor overload) 81E6+ Compressor lock 82E7+ DC fan lock 83E8 Input overcurrent detection 84EA Four way valve abnormality 85F3 Discharge pipe temperature control 87F6 High pressure control in cooling 88H0 Compressor system sensor abnormality 89H6 Position sensor abnormality 90H8 DC voltage / current sensor abnormality 92H9 Outdoor temperature thermistor or related abnormality 93J3+ Discharge pipe thermistor or related abnormality 93J6 Outdoor heat exchanger thermistor or related abnormality 93L3 Electrical box temperature rise 95L4 Radiation fin temperature rise 97L5+ Output overcurrent detection 99P4 Radiation fin thermistor or related abnormality 93
