SiBE07-618_D TroubleshootingService Diagnosis 594. Troubleshooting4.1 Error Codes and Description★: Displayed only when system-down occurs.Error Codes Description ReferencePageSystem 00 Normal —U0★ Refrigerant shortage 89U2 Low-voltage detection or over-voltage detection 91U4 Signal transmission error (between indoor unit and outdoor unit) 65UA Unspecified voltage (between indoor unit and outdoor unit) 66IndoorUnit A1 Indoor unit PCB abnormality 60A5 Freeze-up protection control or heating peak-cut control 61A6 Fan motor (AC motor) or related abnormality 63C4 Indoor heat exchanger thermistor or related abnormality 64C9 Room temperature thermistor or related abnormality 64OutdoorUnit E1 Outdoor unit PCB abnormality 67E5★ OL activation (compressor overload) 68E6★ Compressor lock 69E7 DC fan lock 70E8 Input overcurrent detection 71EA Four way valve abnormality 72F3 Discharge pipe temperature control 74F6 High pressure control in cooling 75H0 Compressor system sensor abnormality 76H6 Position sensor abnormality 77H8 CT or related abnormality 79H9 Outdoor temperature thermistor or related abnormality 81J3 Discharge pipe thermistor or related abnormality 81J6 Outdoor heat exchanger thermistor or related abnormality 81L3 Electrical box temperature rise 83L4 Radiation fin temperature rise 85L5 Output overcurrent detection 87P4 Radiation fin thermistor or related abnormality 81U7 Signal transmission error (on outdoor unit PCB) 92
