
Maintenance & Troubleshooting
Common error/protection and maintenance
Code Error Cause Action
PF Low pressure protection/
pressure valve break
down/Refrigerant leak
1 The ambient temperature is too low
2 The expansion valve can not open.
3 Refrigerant leak.
1 Wait until ambient is higher than
permitted value.
2 Change the expansion valve.
3 Check out and mend the leak,
recharge refrigerant.
E4 High pressure protection
1 The ambient temperature is too
high.
2 Too high water temperature setting.
3 Refrigerant overcharge.
1 Wait until ambient is lower than
permitted value.
2 Set the water temp lower .
3 Discharge some refrigerant.
P3 Water temp sensor error 1 The sensor is damaged.
2 The sensor is not well connected
with the circuit board.
1 Change the sensor.
2 Reconnected the sensor with the
circuit board.
P1 Coil temp sensor error 1 The sensor is damaged.
2 The sensor is not well connected
with the circuit board.
1 Change the sensor.
2 Reconnected the sensor with the
circuit board.
P2 Discharge air sensor error 1 The sensor is damaged.
2 The sensor is not well connected
with the circuit board.
1 Change the sensor.
2 Reconnected the sensor with the
circuit board.
E3 Discharge temp protection
(Discharge temp is too high)
1 No water flow through the heat
exchanger
2 Refrigerant leak
3 The expansion valve can not open.
1 Change the filter or flush the
pipe or Check the circulation
pump.
2 Check out and repair the leak,
recharge refrigerant.
3 Change the expansion valve.
PD Water flow switch error
Remark:the machine off code :
1- Power off 2- meet set temperature 3- Water-switch breakdown 4-anti-frozen finishing. then stop the machine
5- Defrosting preparation 6- Defrosting off 7-Mode change 8- Exhaust air temp is too high, then stop the machine.
9-Low-pressure switch cutting 10- High-pressure switch cutting 11-Water-temperature resistance’s breakdown
12-Pipe-temperature resistance’s breakdown 13-ambientl temperature resistance’s breakdown
The manometer instruction
This manometer is a kind of high pressure equipment
when unit is on, the pointer would point to high
pressure of refrigerant, the max protection value
is 42kg/cm2.When unit is off, the pointer would
point to same value as actual ambient
temperature(e.g.28℃)and related
pressure(18kg/cm2).
After off season before restart the unit, the user is advised to check this manometer,
if ambient temperature valve is smaller than 2℃ which the pointer points to, it means
that refrigerant has leaked a lot, and need to confirm with professional engineer asap.
15 ENGLISH