Hot Water Series
9.7 Trouble Shooting
Users should contact with the professional maintenance staff when there is a
problem with the heat pump. Maintenance stuff may need to refer to the following
table for troubleshooting.
Malfunction Possible Problems Disposing Methods
Heat pump unit is
out of operation.
1. Power source fault.
2. Loose connection of
power wire.
3. Power fuse burnt out.
4. Low water level switch is
not on.
1. Cut off the power source
and check.
2. check the power wire
connection.
3. Check the fuse.
4. Supply water until the
water level switch is on.
Water pump is
running but no
water circulation or
much noise made by
water pump
1. Few water in the system.
2. Air exists in the water
system.
3. Some valves are not
opened.
4. The water filters is
blocked up.
1. Fill water into the water
supply system.
2. Discharge air from the
water system.
3. Open all the valves in the
system.
4. Clean the water filter.
Low heating
capacity.
1. Lack of refrigerant.
2. Bad water system heat
preservation.
3. Low evaporator heat
transferring.
4. Low water flow volume.
1. leakage hunting and fix it,
discharge all the refrigerant
and inject the right amount.
2. improve the heat
preservation.
3. Wash the evaporator.
4. Clean the water filter.
Heavy frosting, low
heating capacity.
1. The evaporator is too
dirty.
2. Defrost sensor fault.
3. The 4 way valve can not
change direction.
4. Over long defrosting
duration.
1. Wash the evaporator.
2. Change a new defrost
sensor.
3. Check the solenoid if it is
energized.
4. Change the temperature
for entering defrost and the
duration.
High noise of
compressor.
1. Liquid refrigerant into
the compressor.
2. Interior component of
the compressor is faulty.
1. Check if the thermostatic
expansion valve is faulty.
2. Change the compressor.
37
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