
Syst2: User Side Antifreezing
Prot. 3+ E271 The water flow of the system is insufficient
Inspect whether the water flow of the water
pipe conforms to related requirements and
check the water pump for any blockage
Water(Out) High Temp Prot. 3+
Excessively high water outlet temperature
Low Water Flow Prot. 3+ E035 The system has no water or too low volume of
water
Check if the water flow of water pipe meets
the requirements and if the water pump is
Syst1: Exhaust Air High Temp
P182 The system compressor is overloaded
Inspect whether the operation of System 1
compressor is normal
Syst2: Exhaust Air High Temp
Prot. 3+
P282 The system compressor is overloaded
Inspect whether the operation of System 2
compressor is normal
Water In/Out Large Temp Diff
Prot. 3+ E06 The water flow of the system is insufficient, the
pressure difference of the water system is small
Inspect whether the water flow of the water
pipe conforms to related requirements and
check the water pump for any blockage
Water(Out) Low Temp Prot.
3+
E071 Excessively low water outlet temperature
Water In Sensor Fault P01
The temperature sensor is open or short
circuited
Check and replace inlet water temperature
sensor
Water Out Sensor Fault P02
The temperature sensor is open or short
circuited
Check and replace outlet water temperature
sensor
Syst1: Coil Temp Sensor1 Fault P150
The temperature sensor is open or short
circuited
Check and replace the system 1 coil 1
temperature sensor
AT Sensor Fault P04
The temperature sensor is open or short
circuited
Check and replace the ambient temperature
sensor
Syst1: Suction Temp Sensor
Fault
P17
The temperature sensor is open or short
circuited
Check and replace the system 1 return air
temperature sensor
Syst1: User Side Antifreezing 1
Sensor Fault
P191
The temperature sensor is open or short
circuited
Check and replace the system 1 use side
antifreeze 1 temperature sensor
Syst2:Coil Temp Sensor1 Fault P250
The temperature sensor is open or short
circuited
Check and replace the system 2 coil 1
temperature sensor
Syst1: Coil(Out) Temp Sensor
Fault
P152
The temperature sensor is open or short
circuited
Check and replace the system 1 coil outlet
temperature sensor
Syst2: Coil(Out) Temp Sensor
Fault
P252
The temperature sensor is open or short
circuited
Check and replace the system 2 coil outlet
temperature sensor
Syst1: EVI(In) Temp Sensor
Fault
P101
The temperature sensor is open or short
circuited
Check and replace the system 1 EVI inlet
temperature sensor
Syst1: EVI(Out) Temp Sensor
Fault
P102
The temperature sensor is open or short
circuited
Check and replace the system 1 EVI outlet
temperature sensor
Syst1: Exhaust Air Temp Sensor
Fault
P181
The temperature sensor is open or short
circuited
Check and replace the system 1 exhaust
temperature sensor
Water Level Sensor Fault E036
Open circuit or short circuit of the water level
sensor
Inspect and replace water level sensor
Syst1: Low Pressure Sensor
Fault
PP11 The sensor is open or short circuited
Check and replace the system 1 low pressure
sensor
Syst2: Suction Temp Sensor
Fault
P27 The temperature sensor is open or short circuited
Check and replace the system 2 return air
temperature sensor
Syst2: User Side Antifreezing 1
Sensor Fault
P291 Temperature sensor fault
Check if the temperature sensor is working
properly
Syst1: High Pressure Sensor
PP12 The sensor is open or short circuited
Check and replace the system 1 high
pressure sensor
Syst2: High Pressure Sensor
Fault
PP22 The sensor is open or short circuited
Check and replace the system 2 high
pressure sensor
Sensor
P281 Open circuit or short circuit of the temperature
sensor
Inspect and replace System 2 exhaust
temperature sensor
Syst2: Low Pressure Sensor
Fault
PP21 Open circuit or short circuit of the sensor
Inspect and replace System 2 low-voltage
sensor
Water Tank Temp Fault P03
Open circuit or short circuit of the temperature
sensor
Inspect and replace water tank temperature
sensor
Syst2: EVI(In) Temp Sensor
P201
Open circuit or short circuit of the temperature
sensor
Inspect and replace System 2 enthalpy inlet
temperature sensor
Syst2: EVI(Out) Temp Sensor
Fault
P202
Open circuit or short circuit of the temperature
sensor
Inspect and replace System 2 enthalpy outlet
temperature sensor
Excessively low environment temperature
Syst1: Coil Temp Sensor2 Fault P154 The temperature sensor is open or short circuited
Check and replace the system 1 coil 2
temperature sensor
DC Fan Board 2 Communication
Fault E082 Communication of the speed regulation module
2 with main board is abnormal
Check the speed regulation module 2 and the
main board and if their connections are
Syst2: Coil Temp Sensor2 Fault P254 The temperature sensor is open or short circuited
Check and replace the system 2 coil 2
temperature sensor
Syst1: Comp. Communication
Fault F151 Communication failure with system 1
compressor drive board
1. Check if the communication line is normal;
2. Check if the system 1 compressor drive
System 1 compressor failed to start
1. Check if the compressor line is normal;