Huawei NetCol8000-A Maintenance And Troubleshooting Manual page 23

Troubleshooting (2)
Symptom
The compressor exhaust
temperature is too high.
The compressor exhaust
temperature is too low.
The compressor suction
temperature is too low or liquid
returns.
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Possible Cause
The outdoor fan fails.
Check whether the refrigerant
amount is properly (the low
pressure is too low).
Refrigerant is leaking.
The refrigerant flled is
insufcient.
The indoor temperature is too low. Change the temperature setting.
Filters are clogged with dirt.
The static over temperature
threshold is not properly set for
the thermostatic expansion valve.
The sensing bulb of the
thermostatic expansion valve has
fallen of.
The external residual pressure is
too high, and air fow decreases.
The air exhaust pressure is too
low.
Solution
Check whether the outdoor fan
works properly.
Verify that the amount of
refrigerant is proper.
Check the pipeline for any
leakage.
Add the refrigerant.
Replace the flters.
Optimize settings for the
thermostatic expansion valve.
Check the sensing bulb of the
thermostatic expansion valve.
Check whether the air channels
are blocked.
Check whether the controller
and driver of the outdoor fan
work properly.
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