Huawei NetCol8000-A Maintenance And Troubleshooting Manual page 24

Troubleshooting (3)
Symptom
Compressor generate
excessive noises.
The compressor suction
temperature is too high.
An indoor fan fails to start.
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Possible Cause
Liquid returns in a compressor.
The lubricant is insufcient.
The transport sheet metal is not
removed from a compressor.
Suction temperature is higher than
25°C.
Either the main circuit breaker or the
indoor fan circuit breaker is not
switched on.
An indoor fan contactor has an
abnormal pickup.
An indoor fan is protected by a
thermal overload relay.
An indoor fan is protected by an
internal high-temperature guard.
An indoor fan is damaged.
Solution
Check whether the oil
temperature and exhaust
temperature are within a normal
range.
Add the lubricant.
Remove the sheet metal.
Adjust the thermostatic
expansion valve or add
refrigerant.
Check the circuit breaker status.
Check whether the main control
board sends signals to the indoor
fan contactor and whether the
contactor is
damaged.
Check the thermal overload
relay status and the fan current.
Check the high-temperature
protection switch status.
Measure the output voltage of
the indoor fan contactor. If the
voltage is in the range of main
input voltage with the 10%
deviation, the fan is damaged.
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Replace the faulty indoor fan.