SiBE041011EC TroubleshootingService Diagnosis 624. Troubleshooting4.1 Error Codes and Description+: Displayed only when system-down occurs.Error Codes Description ReferencePageSystem 00 Normal —U0+ Refrigerant shortage 68U2 Low-voltage detection or over-voltage detection 70U4 Signal transmission error (between indoor unit and outdoor unit) 72UA Unspecified voltage (between indoor unit and outdoor unit) 75IndoorUnit A1 Indoor unit PCB abnormality 63A5 Freeze-up protection control / heating peak-cut control 64A6 Fan motor (DC motor) or related abnormality 65C4 Indoor heat exchanger thermistor or related abnormality 67C9 Room temperature thermistor or related abnormality 67OutdoorUnit E1 Outdoor unit PCB abnormality 76E5+ OL activation (compressor overload) 78E6+ Compressor lock 80E7+ DC fan lock 81E8 Input overcurrent detection 82EA Four way valve abnormality 83F3 Discharge pipe temperature control 85F6 High pressure control in cooling 86H0 Compressor system sensor abnormality 87H6 Position sensor abnormality 89H8 CT or related abnormality (RK(X)S60F3V1B, 71 class only) 92H9 Outdoor temperature thermistor or related abnormality 94J3+ Discharge pipe thermistor or related abnormality 94J6 Outdoor heat exchanger thermistor or related abnormality 94L3 Electrical box temperature rise 96L4 Radiation fin temperature rise 97L5+ Output overcurrent detection 99P4 Radiation fin thermistor or related abnormality 94U7 Signal transmission error on outdoor unit PCB(RK(X)S60F3V1B, 71 class only) 74
