Troubleshooting SiMT041311E125 Service Diagnosis2. Troubleshooting2.1 Error Codes and DescriptionError Code Unit Description Reference pageBasic Failure DiagnosisAir conditioner does not run. 126Air conditioner runs but does not cool (heat) the room. 128When operation starts, safety breaker works. 129Air conditioner makes big noise and vibration. 130Air is not humidified enough. 131FLASH STREAMER AIR PURIFYING operation does not run. 132INTELLIGENT EYE operation does not run. 133A1IndoorIndoor unit PCB abnormality 134A5 Freeze-up protection control / heating peak-cut control 135A6 Fan motor (DC motor) or related abnormality 137C4 Indoor heat exchanger thermistor or related abnormality 139C9 Room temperature thermistor or related abnormality 139CA Humidity sensor (for humidifying) / humidifying thermistorabnormality 140CC Humidity sensor (for room) abnormality 141E1OutdoorOutdoor unit PCB abnormality 142E5 OL activation (compressor overload) 143E6 Compressor lock 145E7 DC fan lock 146E8 Input overcurrent detection 147EA Four way valve abnormality 148F3 Discharge pipe temperature control 150F6 High pressure control in cooling 151H0 Compressor system sensor abnormality 152Power factor correction circuit abnormality 153H6 Position sensor abnormality 154H9 Outdoor temperature thermistor or related abnormality 156J3 Discharge pipe thermistor or related abnormality 156J6 Outdoor heat exchanger thermistor or related abnormality 156J8 Liquid pipe thermistor or related abnormality 156L3 Electrical box temperature rise 158L4 Radiation fin temperature rise 159L5 Output overcurrent detection 161P4 Radiation fin thermistor or related abnormality 156P9Humidifying unitHumidifier fan motor system abnormality / fan lock 163PA Heater wire abnormality 164PH Humidifying thermistor abnormality / humidifying heatertemperature abnormality 165U0SystemRefrigerant shortage 167U2 Low-voltage detection or over-voltage detection 169U4 Signal transmission error (between indoor unit and outdoor unit) 171Outdoor Outdoor unit PCB abnormality or communication circuit abnormality 173U7 Humidifying unit Signal transmission error on microcomputer for humidifying 176UA System Unspecified voltage (between indoor unit and outdoor unit) 177Improper power supply wiring 178Indoor Incomplete setting for hose length 179No display System Lights-out of microcomputer status lamp 180
