Alarm ID
Alarm Name
Alarm
Severity
Possible Cause
Solution
A28D-02
Compressor 1 low
suction pressure alarm
Compressor 2 low
suction pressure alarm
Compressor 3 low
suction pressure alarm
Critical
● The refrigerant
leaks.
● The solenoid valve
is faulty.
● The pressure
displayed is
different from the
actual pressure.
● The filter dryer is
blocked.
● The expansion
valve is blocked or
stuck, or the
expansion valve coil
and cable
connections are
faulty.
● The indoor fan is
faulty.
● 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-01
Compressor 1 drive
alarm
Compressor 2 drive
alarm
Compressor 3 drive
alarm
Major
● The compressor
drive is faulty.
● The compressor is
faulty.
1. Maintain or replace
the compressor
drive.
2. Maintain or replace
the compressor.
A28E-02
Compressor 1 drive
alarm
Compressor 2 drive
alarm
Compressor 3 drive
alarm
Critical
● The compressor
drive is faulty.
● The compressor is
faulty.
1. Maintain or replace
the compressor
drive.
2. Maintain or replace
the compressor.
A28E-04
Compressor 1 drive
alarm
Compressor 2 drive
alarm
Compressor 3 drive
alarm
Major
The fans in the
compressor drive are
faulty.
Check the fans in the
compressor drive.
FusionCol8000-E240 Modular Indirect Evaporative
Cooling System
User Manual
8 System Maintenance
Issue 02 (2021-04-15)
Copyright © Huawei Technologies Co., Ltd.
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