Alarm
ID
Alarm Name
Alar
m
Seve
rity
Possible Cause
Solution
A28D-0
2
Compressor
low suction
pressure alarm
CRITI
CAL
1. The refrigerant
leaks.
2. The solenoid
valve is faulty.
3. The pressure
displayed is
different from the
actual pressure.
4. The filter dryer
is blocked.
5. The expansion
valve is blocked or
stuck, or the
expansion valve
coil and cable
connections are
faulty.
6. The indoor fan
is faulty.
7. The ambient
temperature is
below the lower
threshold.
1. Identify and repair
the leaking point, and
refill refrigerant after
maintenance.
2. Maintain or replace
the solenoid valve coil
or the solenoid valve.
3. Calibrate or replace
the pressure sensor.
4. Maintain or replace
the filter dryer.
5. Maintain or replace
the expansion valve or
the coil, and reconnect
cables.
6. Maintain or replace
the indoor fan.
7. Measure the ambient
temperature.
A28E-0
1
Compressor
drive alarm
MAJ
OR
1. The compressor
drive is faulty.
2. The compressor
is faulty.
1. Maintain or replace
the compressor drive.
2. Maintain or replace
the compressor.
A28E-0
2
Compressor
drive alarm
CRITI
CAL
1. The compressor
drive is faulty.
2. The compressor
is faulty.
1. Maintain or replace
the compressor drive.
2. Maintain or replace
the compressor.
A28E-0
4
Compressor
drive alarm
MAJ
OR
The fans in the
compressor drive
are faulty.
1. Check the fans in the
compressor drive.
NetCol5000-A050 In-row Air Cooled Smart Cooling
Product
User Manual
9 Alarm Reference
Issue 08 (2021-09-17)
Copyright © Huawei Technologies Co., Ltd.
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