Phase sequence protection
Failure of Inner condenser
temperature sensor
Failure of external condenser
temperature sensor
Failure of high refrigerant
pressure sensor
Failure of low refrigerant pressure
sensor
Failure of four way valve
Failure of outdoor ambient
temperature sensor
Failure of compressor exhaust
temperature sensor
Inverter driver or module
failure
3 times occur of
drive module
protection within 30 minutes
Failure of current sensor
System can’t get the value of current
Communication failure of
outdoor units
Communication failure between power
supply board and module board
EEPROM fault of liner controller
System can’t get the value of EEPROM
Outdoor unit EEPROM fault
System can’t get the value of EEPROM
Outdoor dc fan motor doesn’t work or
speed is too low
Failure of return gas temperature
sensor
Failure of voltage sensor
System can’t get the value of voltage
Failure of EVI condenser inlet
temperature sensor
Failure of EVI condenser outlet
temperature sensor
High refrigerant pressure
protection
System refrigerant pressure is too high
Low refrigerant pressure
protection
System refrigerant pressure is too low
Failure of inlet temperature
sensor
Failure of outlet temperature
sensor
Water flow switch protection
Inlet and outlet water
temperature difference
protection
The temperature difference between
the inlet and outlet water is too large
Winter (level 1) frost protection
Winter (level 2) frost protection
Water temperature over/under
protection
Hot water temperature is overheating
protection or cooling water temperature