Si04-402A TroubleshootingService Diagnosis 734. Troubleshooting4.1 Error Codes and Description+: Displayed only when system-down occurs.Code Indication Description ReferencePageSystem 00 Normal —U0+ Insufficient gas 101U2 Over-voltage detection 103U4 Signal transmission error (between indoor and outdoor unit) 81U5 Signal transmission error (between indoor unit and wired remotecontroller) 82UA Unspecified voltage (between indoor and outdoor unit) 83IndoorUnit A1 Indoor unit PCB abnormality 74A5 Freeze-up protection control or high pressure control 75A6 Fan motor or related abnormality 77C4 Heat exchanger thermistor abnormality 79C7 Front panel open / close fault 80C9 Room temperature thermistor abnormality 79OutdoorUnit E1 Outdoor unit PCB abnormality 84E5+ OL activation (compressor overload) 85E6+ Compressor lock 86E7 DC fan lock 87E8 Input over current detection 88EA Four way valve abnormality 89F3 Discharge pipe temperature control 91F6 High pressure control in cooling 92H0 Sensor abnormality around compressor system 94H6 Position sensor abnormality 95H8 DC voltage / current sensor abnormality 96H9 Outdoor air thermistor or related abnormality 97J3 Discharge pipe thermistor or related abnormality 97J6 Heat exchanger thermistor or related abnormality 97L5 Output over current detection 99
