Alarm ID
Alarm Name
Alarm
Severity
Possible Cause
Solution
A28C-01
A28C-04
Compressor 1 high
discharge pressure
alarm
Compressor 2 high
discharge pressure
alarm
Major
● The input power of
the outdoor unit
has an open phase,
incorrect phase
sequence, or is
unavailable.
● Cables to the
indoor or outdoor
fan are not
properly connected.
● The condenser fins
are dirty or
blocked.
● The outdoor fan or
its drive is faulty.
● The pressure
displayed is
different from the
actual pressure.
● The refrigerant is
overfilled.
● The exhaust fan is
faulty.
● The supply water
temperature of the
water-cooled
module is too high.
● The water supply
for the water-
cooled module is
insufficient.
● The inside of the
water-cooled
module is dirty or
blocked.
● The water valve of
the water-cooled
module is faulty.
1. Check the input
power of the
outdoor unit.
2. Check the cables to
the indoor and
outdoor fans.
3. Clean the
condenser fins.
4. Maintain or replace
the outdoor fan or
its drive.
5. Calibrate or replace
the pressure sensor.
6. Decrease certain
amount of
refrigerant.
7. Maintain or replace
the exhaust fan.
8. Check the supply
water temperature
of the water-cooled
module.
9. Check the water
supply of the
water-cooled
module.
10.Clean the water-
cooled module.
11.Maintain the water
valve of the water-
cooled module.
NetCol8000-A(045, 055, 060, 090, 120) In-room Air
Cooled Smart Cooling Product
User Manual
10 Alarm Reference
Issue 05 (2020-10-10)
Copyright © Huawei Technologies Co., Ltd.
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