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11. Trouble shooting
S/
Fault description Possible cause
N
1.Air or non-condensable gas found in the system Discharge and empty, if necessary, the
2.High suction pressure
3.Undesirable high-pressure switch
4.Dirty or clogged fin of the condenser
5.Insufficient air capacity or faulty fan of the
Too high
condenser.
1
exhaust
6.High charge of refrigerant
pressure
7.High ambient temperature
8.Insufficient water flow
9.Water-side heat exchanger scaling or with
foreign matters inside
10.High outlet temperature of water-side heat
exchanger
1.Insufficient refrigerant
2.Undesirable low-pressure switch
3.Insufficient water flow
4.Low water inlet temperature at water side
Low suction
5.Water-side heat exchanger scaling or with
2
pressure
foreign matters inside
6.Insufficient air capacity
7.Short circuit found in air circuit
8.Incomplete defrosting
1.Lack of refrigerant
2.Low suction pressure
Too low exhaust
3
3.Low ambient temperature of air-side heat
pressure
exchanger
4.Too low water temperature at water side
1.Too high charge of refrigerant
2.High water inlet temperature at water side
4
High suction
3.High ambient temperature of air-side heat
pressure
exchanger
1.Poor ventilation around the unit
Overtemperatur
e of exhaust
2.Too low ambient temperature
5
temperature
3.Dirty or clogged filter at fluorine side
sensor
4.Incomplete frosting (for heating) or no frosting
1.Damaged sensor
Open circuit or
short circuit of
6
temperature
2.Poor connection of sensor
sensor
1.Loose metal plate bolts
2.Liquid impact due to entry of liquid refrigerant
7
Abnormal noise
into the compressor
3.Poor compressor
Troubleshooting
non-condensable gas
Refer to "High Suction Pressure"
Replace the high-pressure switch
Clean the air-side heat exchanger
Check the fan
Adjust the charge of refrigerant
Inspect the ambient temperature
Check the water flow
Clean up the incrustation scale
Check the water temperature
Adjust the charge of refrigerant
Replace the low-pressure switch
Check the water flow
Check the water temperature
Clean up the incrustation scale
Check the fan
Check the cause of short circuit and take
troubleshooting
Replace the poor 4-way valve or defrosting
sensor
Adjust the charge of refrigerant
Refer to "Low Suction Pressure"
Check the ambient temperature
Check the water temperature
Adjust the charge of refrigerant
Check the water temperature
Check the ambient temperature
Clean up the obstacles around the unit, or
add air ducts
Shut down
Replace the filter
Change the frosting parameters
Replace the sensor
Reconnect the sensor
Retighten bolts
Adjust the charge of refrigerant or the poor
throttling device
Replace the compressor
44
Remarks
Cooling/heating
Cooling/heating
Cooling/heating
Cooling
Cooling
Cooling
Cooling
Heating
Heating
Heating
Cooling/heating
Cooling/heating
Cooling
Cooling
Cooling
Heating
Heating
Heating
Cooling/heating
Cooling/heating
Cooling
Heating
Cooling/heating
Cooling
Heating
Heating
Heating
Cooling/heating
Heating
Cooling/heating
Cooling/heating
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