Huawei NetCol5000-A021 User Manual page 159

NetCol5000-A021 In-row Air Cooled Smart Cooling
Product
User Manual (208 V)
Alarm Alarm Name
ID
a003 Return-air LT
a004 Return-air 2
humid invalid
a007 Return-air 2
T/H brd comm
failed
a008 Comp HP
switch alarm
Issue 03 (2020-01-10)
Alarm Impact
Severity
Warning The alarm is
generated.
Major The alarm is
generated.
Major The alarm is
generated.
Major The alarm is
generated, and
the compressor
is forcibly shut
down.
Copyright © Huawei Technologies Co., Ltd.
6 System Operation and Maintenance
Possible Causes Solution
the actual temp.
1. The load is low. 1. Contact Huawei technical
2. The ambient
temp is low. 2. Check the ambient temp.
3. The return-air 3. Adjust the return-air LT
LT alarm
threshold is
4. Calibrate or replace the
inappropriate.
4. The temp
displayed is
different from
the actual temp.
1. Dirt or water 1. Remove dirt or water from
exists around
the T/H sensor,
2. Maintain or replace the
which leads to a
detection fault.
2. The temp
sensor is faulty.
1. The cables to 1. Check the cables to the
the T/H sensor
are loose or
2. Set the DIP switch of the
damaged.
2. The DIP switch
3. Maintain or replace the
of the T/H
sensor is set
4. Maintain or replace the
incorrectly.
3. The T/H sensor
is faulty.
4. The
communication
port of the
control board is
faulty.
1. The outdoor 1. Check the outdoor unit
unit input
power has an
2. Check the signal cables to
open phase,
incorrect phase
3. Clean the condenser fins.
sequence, or is
4. Maintain or replace the
unavailable.
2. Signal cables to
5. Check cables to the high
the outdoor unit
are not properly
6. Maintain or replace the
connected.
3. The condenser
7. Maintain or replace the
fins are
blocked.
8. Decrease certain amount of
4. The outdoor fan
support.
alarm threshold.
abnormal temp sensors.
the T/H sensor.
temp sensor.
T/H sensor.
T/H sensor correctly.
T/H sensor.
control board.
power supply.
outdoor unit.
outdoor fan drive or fan.
pressure switch.
high pressure switch.
EEV.
151