SiBE06-708 TroubleshootingService Diagnosis 874. Troubleshooting4.1 Error Codes and Description+: Displayed only when system-down occurs.Code Indication Description ReferencePageSystem 00 Normal —U0+ Insufficient gas 129U2 Low-voltage detection or over-voltage detection 133U4 Signal transmission error (between indoor and outdoor unit) 94UA Unspecified voltage (between indoor and outdoor unit) 96IndoorUnit A1 Indoor unit PCB abnormality 88A5 Freeze-up protection control or high pressure control 89A6 Fan motor or related abnormality 91C4 Heat exchanger temperature thermistor abnormality 93C9 Room temperature thermistor abnormality 93OutdoorUnit E1 Outdoor unit PCB abnormality 97E5+ OL activation (compressor overload) 98E6+ Compressor lock 99E7 DC fan lock 100E8 Input over current detection 101EA Four way valve abnormality 104F3 Discharge pipe temperature control 108F6 High pressure control in cooling 110H0 Compressor system sensor abnormality 112H6 Position sensor abnormality 115H8 DC voltage/current sensor abnormality 116CT or related abnormality 117H9 Outdoor air thermistor or related abnormality 119J3 Discharge pipe temperature thermistor or related abnormality 119J6 Heat exchanger temperature thermistor or related abnormality 119L3 Electrical box temperature rise 121L4 Radiation fin temperature rise 123L5 Output over current detection 127P4 Heat radiation fin thermistor or related abnormality 119U7 Signal transmission error on outdoor unit PCB 135
