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Maintenance
■
Common Faults and Troubleshooting
S/N Fault description Possible cause
Fault in flow
8
switch
Fault in
9
communication of
wired controller
Over-current fault
10
of compressor
Open circuit in
11
low-pressure
sensor
1.
Air found in the water system
2.
Water-side heat exchanger scaling
or with foreign matters inside
3.
Poor switch
4.
Unevenly distributed flow in water
pipelines
5.
Out-of-service water pump
6.
Insufficient types of water pumps
1.
Incorrect unit numbering
2.
Incorrect connection of
communication wires
3.
Damaged PCB
4.
Poor wired controller
1.
High exhaust pressure and high
suction pressure
2.
High or low voltage, single phase or
phase imbalance
3.
Short circuit in motor or terminal
1.
Damaged sensor
2.
Poor connection of 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
22
Remarks
Cooling/heating
Cooling/heating
Cooling/heating
Cooling/heating
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