Hot Water Series
Compressor is
out of operation.
1. Power source fault.
2. Compressor AC contactor
damaged.
3. Loosen wire connection.
4. Over-heat protection.
5. Over-high water temp.
6. Low water flow volume.
1. Check the power source and
change faulty components.
2. Change the contactor.
3. Check every wire connection
of compressor.
4. Check refrigerant leakage.
5. Bring down the water temp.
set value.
6. Clean the filter and check if
there is air inside the water
system.
Fan is out of
operation.
1. Fan motor wire loosen.
2. Fan motor burnt.
3. Fan AC contactor fault.
1. Check every wire of the fan
connection.
2. change the motor.
3. change the AC contactor.
Low water flow
volume
protection.
1. Circulation pump fault.
2. Circulation pump is too
small.
3. Water filter blockage.
4. Flow volume control
device restore.
1. Check the operation of the
circulation pump and fix it.
2. Change a bigger pump.
3. Wash the water filter.
4. Adjust or change the flow
volume control device.
Over-high
compressor
discharge
pressure
1. Low water flow volume.
2. Thermostatic expansion
valve openings is not correct,
or blockage.
1. Check the circulation pump,
and the water filter.
2. Check and adjust the
openings, or directly change
the expansion valve.
Over-low
compressor
suction pressure.
1. Not enough refrigerant.
2. Over-big pressure drop
through the heat exchanger.
1. Check refrigerant leakage.
2. Check and adjust the
expansion valve openings.
Shortage of oil in
compressor.
Shortage of lubricant oil. Find out the suitable kind of oil
for the compressor and inject
some amount.
Thermostatic
throttle valve can
not start.
1. The switch for it is not
open.
2. Low water pressure, over-
small water pipe diameter,
over-long pipe.
1. Inspect the power source of
the solenoid valve.
2. Check if there is blockage in
the pipes, and add boosting
pump when necessary.
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