31
13.4.5.
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
1. Power source fault.
1. Cut off the power source
out of operation.
2. Loose connection of
and check.
power wire.
2. check the power wire
3. Power fuse burnt out.
connection.
4. Low water level switch is
3. Check the fuse.
not on.
4. Supply water until the
water level switch is on.
Water pump is
1. Few water in the system.
1. Fill water into the water
running but no
2. Air exists in the water
supply system.
water circulation or
system.
2. Discharge air from the
much noise made by 3. Some valves are not
water system.
water pump
opened.
3. Open all the valves in the
4. The water filters is
system.
blocked up.
4. Clean the water filter.
Low heating
1. Lack of refrigerant.
1. leakage hunting and fix it,
capacity.
2. Bad water system heat
discharge all the refrigerant
preservation.
and inject the right amount.
3. Low evaporator heat
2. improve the heat
transferring.
preservation.
4. Low water flow volume.
3. Wash the evaporator.
4. Clean the water filter.
Heavy frosting, low
1. The evaporator is too
1. Wash the evaporator.
heating capacity.
dirty.
2. Change a new defrost
2. Defrost sensor fault.
sensor.
3. The 4 way valve can not
3. Check the solenoid if it is
change direction.
energized.
4. Over long defrosting
4. Change the temperature
duration.
for entering defrost and the
duration.
High noise of
1. Liquid refrigerant into
1. Check if the thermostatic
compressor.
the compressor.
expansion valve is faulty.
2. Interior component of
the compressor is faulty.
2. Change the compressor.
