Discharge temp. sensor protection
Check if the sensor is disconnected or short-circuited
Outdoor coil temp. sensor protection
Check if the sensor is disconnected or short-circuited
Suction temp. sensor protection
Check if the sensor is disconnected or short-circuited
Cooling coil temp. sensor protection
Check if the sensor is disconnected or short-circuited
Outlet water temp. sensor protection
Check if the sensor is disconnected or short-circuited
Return water temp. sensor protection
Check if the sensor is disconnected or short-circuited
Water tank temp. sensor protection
Check if the sensor is disconnected or short-circuited
Controller communication error
1. Check if the controller is match with the main board
2. Check if the communication cable (extension cable) is
connected correctly and if it is short-circuited
3. Check if the communication cable (extension cable) is
connected to the right terminal on the main board
Outdoor ambient temp. sensor protection
Check if the sensor is disconnected or short-circuited
Indoor and outdoor unit communication error
1. Check if the communication cable between indoor unit
and outdoor unit is connected correctly
2. Check if the main board of indoor unit is match with the
main board of outdoor unit
3. Replace the board of indoor unit or board of outdoor
unit
Main loop high pressure sensor failure
Check if the sensor is disconnected or short-circuited
Main loop low pressure sensor failure
Check if the sensor is disconnected or short-circuited
EEV loop low pressure sensor failure
Check if the sensor is disconnected or short-circuited
Main loop high pressure protection
Check if the sensor is disconnected or short-circuited
Main loop low pressure protection
1.Check if there's refrigerant leakage
2..If refrigerant leakage is confirmed, fix the leakage point,
vccumized the system and fill in the refrigerant according
to the information on the technical label
EEV loop low pressure protection
Check if the sensor is disconnected or short-circuited
Start pressure difference protection
Operation pressure difference protection
IPM module high temperature protection
Compressor abnormal start
Compressor phase current protection
AC high/low voltage protection
DC-link high/low voltage protection
Water flow switch protection
Check if the water system, water pump, water flow switch
is normal
1.Check if the inlet water temp. is too high or if water inlet
is blocked
2.Check if the fan blades are too dirty that influence the
heat exchange efficiency of the heat exchanger
3.Check if the refrigerant amount is too high
4.Check if the setting water tank temperature is too high
1.Check if there's refrigerant leakage
2.If refrigerant leakage is confirmed, fix the leakage point,
vaccumized the system and fill in the refrigerant according
to the information on the technical label
High discharge temp. protection
1.Check if the water system is normal, check if the water
flow volume is small
2.Check if the unit operation is normal, check if the
discharge temp. and system pressure is normal
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