53
Table 3-4.3: Phenomena
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Phenomena
Possible reason
Detect and settle measure
Compressor is unable to drive
1. Power errors.
Connected with wrong phase sequence.
2. Wire connection is loos
e
.
Check and
retighten
again.
3. Relay or fuse errors.
Check and repair.
4. Compressor errors.
Change the compressor.
Fan has loud noise
1. Fixing screw of the fan is loose.
Re-fasten the fixing screw of the fan.
2. Fan blade touch
ing
the cover shell or screen
Check and adjust.
3. The fan
vibrates
.
Change the fan.
Abnormal noise given out from
compressor
1. Liquid refrigerant flows into compressor and
produces liquid
slugging
.
Check the EXV, and whether the
temperature sensor
is
loos
e.
R
epair.
2. Damage
to
the compressor inner
components.
Replace the compressor.
Water pump not operat
ing
or
operating
abnormally
1. Power errors.
Check and repair.
2. Relay error.
Replace the relay.
3. There is gas in the water pipe.
Drain off the gas.
Compressor turns ON and OFF
frequently
1. Bad circulation of water system.
Water system is blocked or there
is air in the system. Check the water
pump, valves, pipeline, and clean the
wate
r fi
lter or drain o
ff
the air.
2. Low load.
Adjust the load or add stored energy
device.
Compressor operates but
water is not heated
1. Refrigerant leakage.
Check, repair and replenish the
refrigerant.
2. Compressor error.
Change the compressor.
No obvious heating effect of the
unit
1. Bad thermal insulation of water system.
Enlarge the thermal insulation of the
system.
2. Bad heat exchanging of evaporator.
Check the air inlet and outlet
and clean the evaporator.
3. Lack of refrigerant.
Check whether there is refrigerant leakage.
4. The water side heat exchanger has blocked.
Clean or change the heat exchanger.
$OOLDQFHR410A Direct Heating Type HPWH 50Hz Technical Manual MCAC-HTSM-201801