Compressor speed malfunction 
Compressor over current protection   
Compressor discharge temperature    protection 
Outdoor current protection 
Anti-cold air in heating mode 
System overpressure protection 
System pressure is too low protection 
Outdoor low ambient temperature protection 
Evaporator coil temperature over high protection 
Evaporator coil temperature over low Protection 
Condenser high temperature protection 
Indoor unit humidity sensor failure 
Frequency limit caused by T2 
Indoor external fan current limit 
Indoor external fan voltage limit 
Frequency limit caused by T3 
Frequency limit caused by TP 
Frequency limit caused by voltage 
Frequency limit caused by current 
Frequency limit caused by PFC 
Frequency limit caused by high pressure 
Frequency limit caused by low pressure 
Frequency limit caused by remote controller 
Indoor units mode conflict(match with multi outdoor unit)