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Troubleshooting
This information is provided for guidance only and is not exhaustive. Please contact your local dealer/service personnel
if the faults persist.
Fault
Possible Causes
Power failure or communication bus failure
"ERR CODE" display on controller
Module in pre-heat condition
Wrong controller setting
Insufficient refrigerant
Low water flow
Power failure or wrong phase sequence
Refrigerant flow back
Compressor mechanical part failure
Insufficient refrigerant
Low water flow
Condenser coil blocked / dirty
Wrong TXV setting
Strainer choked
Low refrigerant flow
Water system choked / air trap
Refrigerant over-charged
Ambient temperauture too high
Un-condensable gas exist in the circuit (example: air)
Condenser coil blocked / dirty
Insufficient refrigerant
Not enough compression or no compression (compressor faulty)
Refrigerant over-charged
Entering water temperature too high
Leakage of 4-way valve
Wrong TXV setting
Insufficient refrigerant
Entering water temperature too low
Expansion device choked.
TXV Faulty
The compresser does not
operate
Compressor frequent cut in / cut
out
Compressor noise
Low condensor pressure
High suction pressure
Low suction pressure
Insufficient Cooling
Suction tube freeze
High condenser pressure
