Indoor / outdoor units communication error
Indoor EEPROM malfunction
Open or short circuit of T3 or T4 temperature sensor
Outdoor unit voltage protection
Outdoor unit over-current protection
Top temperature protection of compressor
Inverter compressor drive protection
Indoor fan speed has been out of control
★ flash at 5Hz, light, ◎flash at 0.5Hz, X extinguished
12.2 Outdoor unit error code explanation:
Outdoor EEPROM malfunction
Indoor / outdoor units communication error
Communication malfunction between IPM board and outdoor main board
Open or short circuit of outdoor unit temperature sensor
Outdoor fan speed has been out of control
No A Indoor unit coil outlet temperature sensor or connector of sensor is defective
No B Indoor unit coil outlet temperature sensor or connector of sensor is defective
No C Indoor unit coil outlet temperature sensor or connector of sensor is defective
No D Indoor unit coil outlet temperature sensor or connector of sensor is defective
No E Indoor unit coil outlet temperature sensor or connector of sensor is defective
High pressure protection (For 38QUS036DS4)
Low pressure protection (For 38QUS036DS4)
Current protection of compressor
Temperature protection of compressor discharge
High temperature protection of condenser
Note: Once these error codes display, they will disappear in at least 30 seconds if the unit come back to
normal.(Except E3&E4)
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