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9.7 Trouble Shooting
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9.6 Manometer Instruction
Malfunction Possible Reasons Solutions Recommended
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. little 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. Faulty 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. Long defrosting duration
1. Wash the evaporator.
2. Change to 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.
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The Manometer is high pressure device that a heat pump uses. When it is on, the Manometer pointer
should point to the maximum pressure value of the refrigerant. The maximum pressure should be
42Kgs to allow for safe use. When the heat pump is off, the pointer will show the ambient temperature
(e.g. 28℃) and related air pressure (e.g.18 k.g/Cm)²
When restarting the heat pump after not using it for a while, please check the manometer ambient
temperature is not smaller than 2℃, If it is below 2℃, then the refrigerant has leaked and you will
need to confirm with a professional engineer as soon as possible.
Users should contact the professional maintenance staff when there is a problem with the heat pump.
The maintenance table below may be helpful when doing the troubleshooting.
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