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S/
Fault description Possible cause
N
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 wires
communication
9
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 phase
compressor
imbalance
3.Short circuit in motor or terminal
Open circuit in
1.Damaged sensor
11
low-pressure
2.Poor connection of sensor
sensor
Troubleshooting
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
30
Remarks
Cooling/heatin
g
Cooling/heatin
g
Cooling/heatin
g
Cooling/heatin
g
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