Chapter Ⅳ Maintenance（2. Troubleshooting）
65
2.3 Other Common Errors and Their Causes
Compressor can‟t
be started up
A、There‟s problem for the power
B、Wire connection is loose
C、Malfunction of relay or fuse
D、Malfunction of compressor
●Check the phase sequence.
●Check it and connect it tightly.
●Check the malfunction cause and resolve it.
●Replace compressor.
A、The fixing bolt for the fan is loose
B、Blades touch outer case or grille
C、The fan can‟t operate placidly
●Tighten the fixing bolts of fan.
●Check it and adjust it.
●Replace the fan.
Big noise for the
compressor
A、There‟s liquid slugging when liquid
refrigerant entering into compressor
B、There‟s damaged part inside the
compressor
●Check whether the expansion valve is valid
and whether the temperature is loose.
●Replace compressor.
Water pump can‟t
operate or the
operation is
abnormal
A、Power malfunction of wiring malfunction
B、Malfunction of relay
C、There‟s air inside the water pipe
●Find out the reason and repair it.
●Replace relay.
●Discharge the air completely.
Compressor is
turned on or turned
off frequently
A、Refrigerant is superfluous or too less
B、Poor circulation for the water system
C、Low load
●Add or release some refrigerant.
●The water system is blocked or there‟s air
inside the water system. Please check water
pump, valve and pipeline, clean the strainer
or discharge air.
●Adjust the load or add energy-storage
device.
Compressor
operates, while the
unit can‟t heat
A、Refrigerant is leaked
B、Malfunction of compressor
●Repair it and complement refrigerant.
●Replace compressor.
The hot water
generation effect is
not obvious
A、The thermal insulation for the water
system is poor
B、The heat-exchanging effect for the
evaporator is poor
C、Refrigerant is insufficient
D、Water side heater exchanger is blocked
●Enforce the thermal insulation for the
system.
●Check whether air inlet and air outlet for the
unit is normal and clean the evaporator.
●Check whether there‟s refrigerant leakage
for the unit.
●Clean or replace the heat exchanger.
Note: The phenomena in the following table are not errors.
Temperature of the
leaving water
fluctuates
Due to difference of the entering water pressure, the leaving water temperature may
fluctuate in special working conditions. It is normal and does not affect actual use. You can
adjust the water pressure properly to improve the phenomenon.
Leaving water
temperature of low
temperature fails to
reach the set
temperature.
In the low temperature condition, the leaving water temperature may fail to reach the set
higher temperature for the purpose of unit protection. It is normal and does not affect
normal use.
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