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Compressor is out
of operation.
1. Power source fault.
2. Compressor AC contactor
damaged.
3. Loose wire connection.
4. Over-heat protection.
5. Over-high water temperature
6. Low water flow volume.
1. Check the power source, change faulty components.
2. Change the contactor.
3. Check every wire connection of compressor.
4. Check gas leakage.
5. Bring down the water temperature value.
6. Clean the filter, check if there is air inside the water
system.
Fan is out of
operation.
1. Loose fan motor wire.
2. Burnt out fan motor.
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
opening is broken /blocked.
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 gas.
2.
Large pressure drops through the
heat exchanger.
1. Check gas 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 suitable type oil into the compressor.
Thermostatic
throttle valve can
not start.
1. The switch for it is not open.
2. Low water pressure, water pipe
diameter too small, pipe is too long.
1. Inspect the power source of the solenoid valve.
2. Check if there is blockage in the pipes, and add
boosting pump when necessary.
Malfunction Possible Reasons Solutions Recommended
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