Error code of engineer mode 
Indoor unit EEPROM parameter error 
Indoor / outdoor unit communication error 
Communication error between indoor unit and indoor external fan module 
Parameters error of indoor external fan 
Phase failure of indoor external fan 
Indoor external fan current sampling bias fault 
Indoor external fan zero speed failure 
Indoor external fan stall failure 
Out of step failure of indoor external fan 
Low voltage protection of indoor external fan DC bus 
Indoor external fan DC bus voltage is too high fault 
Indoor external fan overcurrent fault 
Indoor external fan module protection/hardware Current overload protection 
The indoor fan speed is operating outside of the normal range 
Outdoor unit EEPROM parameter error 
Condenser coil temperature sensor T3 is in open circuit or has short circuited 
Outdoor room temperature sensor T4 is in open circuit or has short circuited 
Compressor discharge temperature sensor TP is in open circuit or has short circuited 
IGBT    temperature sensor TH is in open circuit or has short circuited 
Indoor room temperature sensor T1 is in open circuit or has short circuited 
Evaporator coil temperature sensor T2 is in open circuit or has short circuited 
Outdoor external fan overcurrent fault 
Outdoor external fan module protection/hardware Current overload protection 
Outdoor external fan phase failure 
Outdoor external fan current sampling bias fault 
Zero speed failure of outdoor unit DC fan 
The outdoor fan speed is operating outside of the normal range( 
Refrigerant leak detected 
Water-level alarm malfunction 
IPM malfunction or IGBT over-strong current protection 
Over low voltage protection 
Top temperature protection of compressor or High temperature protection of IPM module 
Communication error between outdoor main chip and compressor driven chip 
Current Input detection protection 
Lack of phase (3 phase) protection