9.1 Indoor Unit Error Display 
Indoor unit EEPROM parameter error 
Indoor / outdoor units communication error 
Zero-crossing signal detection error 
Indoor fan speed has been out of control 
Indoor room temperature sensor T1 open circuit or short 
circuit 
Evaporator coil temperature sensor T2 open circuit or 
short circuit 
Refrigerant leakage detection 
Outdoor ambient temperature sensor T4 open circuit or 
short circuit 
Condenser coil temperature sensor T3 open circuit or 
short circuit 
Compressor discharge temperature sensor T5 open 
circuit or short circuit 
Outdoor unit EEPROM parameter error 
Outdoor fan speed has been out of control 
IPM malfunction or IGBT over-strong current protection 
Over voltage or over low voltage protection 
High temperature protection of compressor top 
diagnosis and solution(only for 9k,12k models) 
Inverter compressor drive error