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5. Troubleshooting
Faults
The Action of
the Protection
Units
The Possible Fault Analysis Solutions
1. No power
display or
phase reverse
The protective
device can’t
work
A. Power is not on.
B. The control circuit fused
C. The phase sequence of power
line is reversed
D. The main power or circuit failure.
A. Check before power is on
B. Check the protection loop.
C. Replace any two of the
power incoming wires.
D. Check or replace.
2. Pump
overload
Loader trips
A. High transient current
B. Pump failure
C. Pump loader failure
A. Reset the loader.
B. Repair or replace
C. Repair or replace
3.Compressor
overload
Loader trips
A. High transient current
B. Compressor failure
C. Compressor loader failure
A. Reset the loader
B. Repair and replace
C. Repair and replace
4. Over high-
pressure
High-pressure
switch trips
A. Too much refrigerant
B. Insufficient condenser air output
C. Too much water scalein the
condenser
D. Drying filter blocked
E. The opening of the expansion
valve is too small
F. Expansion valve fault
G. Fan fault
H. High-pressure switch failure
I. Condensor direct sun light
A. Discharge part of
B. the refrigerant
C. Increase the air volume.
D. Clean the condenser.
E. Clean the drying filter.
F. Adjust the opening properly.
G. Repair and replace
H. Repair and replace
I. Repair and replace
J. Protect the condenser from
direct sunlight.
5. Low
high-pressure
Protective
device no action
A. Insufficient cooling
B. The compressor valve plate is
damaged.
C. The cooling water flow is too
large.
A. Reset the temperature
point.
B. Repair and replace
C. Regulate the water valve
flow.
6. Low
low-pressure
Low-pressure
swtich trips
A. Insufficient refrigerant
B. Drying filter blocked.
C. The opening of the expansion
valve is too small.
D. Expansion valve fault.
E. Low pressure switch fault.
A. Check the system pipe,
weld the pipe and refill the
refrigerant.
B. Clean the drying filter.
C. Adjust the opening properly.
D. Repair and replace
E. Repair and replace
7. Low
high-pressure
Protective
device no action
A. Too large cooling load.
B. Compressor capacity reduced.
C. The opening of the expansion
valve is too large.
D. The refrigerant is overfilled.
A. Adjust the load.
B. Repair and replace
C. Adjust
D. Discharge part of the
refrigerant.
8. Compressor
overload
Protective
device no action
A. The heat of the return pipe
refrigerant is too high.
B. The high pressure is too high.
C. The low pressure is too low.
A. Adjust the opening of the
expansion valve properly.
B. Repair and improve
C. Repair and improve
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