20
CODE
Malfunction
Reason
Resolution
P 04
System 3 high
pressure protection
System 3 high pressure
protection switch off
1. Check if the inlet water temp. is too high or if any
blockage
2. Check if the unit fan blade is so dirty that it influences
the efficiency of the heat exchanger.
3. Check if too much refrigerant.
4. Check if the setting water tank temp. is too high.
P 05
System 4 high
pressure protection
System 4 high pressure
protection switch off
1. Check if the inlet water temp. is too high or if any
blockage
2. Check if the unit fan blade is so dirty that it influences
the efficiency of the heat exchanger.
3. Check if too much refrigerant.
4. Check if the setting water tank temp. is too high.
P 06
System 1 low
pressure protection
System 1 low pressure
switch off
1. Check if there is refrigerant leakage.
2. If refrigerant leakage is confirmed, repair it
and vacuumize it,
then fill refrigerant according to the nameplate.
P 07
System 2 low
pressure protection
System 2 low pressure
switch off
1. Check if there is refrigerant leakage.
2. If refrigerant leakage is confirmed, repair it
and vacuumize it,
then fill refrigerant according to the nameplate.
P 08
System 3 low
pressure protection
System 3 low pressure
switch off
1. Check if there is refrigerant leakage.
2. If refrigerant leakage is confirmed, repair it
and vacuumize it,
then fill refrigerant according to the nameplate.
P 09
System 4 low
pressure protection
System 4 low pressure
switch off
1. Check if there is refrigerant leakage.
2. If refrigerant leakage is confirmed, repair it
and vacuumize it,
then fill refrigerant according to the nameplate.
P 10
Power phase sequence
error
Power phase sequence
error
Check the power supply of the unit.
P 11
System 1 compressor
high discharge
temperature
protection
System 1 compressor
discharge temp.
Higher than 105
℃
1. Check the water in system is clean or not,
ensure there is no corrosive liquid in pipeline.
2. Check
if there’s any refrigerant leakage,
when refrigerant leakage is confirmed, repair it
then vacuumize it, then fill refrigerant according
to the nameplate.
P 12
System 2 compressor
discharge temperature
too high protection
System 2 compressor
discharge temp.
Higher than 105
℃
3. Check the water in system is clean or not,
ensure there is no corrosive liquid in pipeline.
1.
Check if there’s any refrigerant leakage,
when refrigerant leakage is confirmed, repair it
then vacuumize it, then fill refrigerant according
to the nameplate.
P 13
System 3 compressor
discharge temperature
too high protection
System 3 compressor
discharge temp.
Higher than 105
℃
4. Check the water in system is clean or not,
ensure there is no corrosive liquid in pipeline.
1.
Check if there’s any refrigerant leakage,
when refrigerant leakage is confirmed, repair it
then vacuumize it, then fill refrigerant according
to the nameplate.
P 14
System 4 compressor
discharge temperature
too high protection
System 4 compressor
discharge temp.
Higher than 105
℃
5. Check the water in system is clean or not,
ensure there is no corrosive liquid in pipeline.
1.
Check if there’s any refrigerant leakage,
when refrigerant leakage is confirmed, repair it
then vacuumize it, then fill refrigerant according
to the nameplate.
P 15
Large water inlet and
outlet temperature
difference protection
Insufficient water flow and low
water pressure.
1. Check if water system is normal or not.
2. Unit is working or not, temp. of
discharge and pressure of system is
normal or not
P 16
Cooling over-cold
protection
Low outlet water
temperature caused by
abnormal running of
cooling mode
3. Check if water system is normal or not.
1. Unit is working or not, temp. of
discharge and pressure of system is
normal or not
