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S/N Fault description
1. Poor ventilation around the unit
Overtrmperature
2. Too low ambient temperature
of echaust
5
temperature
3. Dirty or clogged filter at fluorine side
sensor
4. Incomplete frosting (for heating) or
no frosting
Open circuit or
1. Damaged sensor
short circuit of
6
temperature
2. Poor connection of sensor
sensor
1. Loose metal plate bolts
2. Liquid impact due to entry of liquid
7
Abnormal noise
refrigerant into the compressor
3. Poor compressor
1. Air found in the water system
2. Water-side heat exchanger scaling
or with foreign matters inside
3. Poor switch
Fault in flow
8
switch
4. Unevenly distributed flow in water
pipelines
5. Out-of-service water pump
6. Insufficient types of water pumps
1. Incorrect unit numbering
Fault in
2. Incorrect connection of
communication
9
communication wires
of wired
controller
3. Damaged PCB
4. Poor wired controller
1. High exhaust pressure and high
suction pressure
Over-current
10
fault of
2. High or low voltage, single phase or
compressor
phase imbalance
3. Short circuit in motor or terminal
Open circuit in
1. Damaged sensor
11
low-pressure
sensor
2. Poor connection of sensor
Possible cause
47
Troubleshooting
Clean up the obstacles around the
unit, or add air ducts
Shut down
Replace the filter
Change the frosting parameters
Replace the sensor
Reconnect the sensor
Retighten bolts
Adjust the charge of refrigerant or
the poor throttling device
Replace the compressor
Discharge air via the exhaust valve
Clean up the incrustation scale
Replace the target flow switch
Adjust the flow in water pipelines
via the shut-off valve
Machine installation must be
ganged
Check it and try to fix it
Check the unit numbering, and
correct it.
Check the order of connection of
communication wires
Replace the PCB
Replace the wired controller
Refer to "High Exhaust Pressure"
and "High Suction Pressure"
Check the power supply
Check the terminal connections
Replace the sensor
Reconnect the sensor
Remark
Heating
Heating
Cooling/
heating
Heating
Cooling/
heating
Cooling/
heating
Cooling/
heating
Cooling/
heating
Cooling/
heating
Cooling/
heating
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