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Alar
m ID
Alarm
Severit
y
Alarm Name
Probable Cause
Solution
A003
-01
WARNI
NG
Return air low
temperature
alarm
1. The temperature
sensors or
temperature and
humidity sensors
are located in
inappropriate
positions.
2. The thermal load
power is low.
3. The ambient
temperature is
below the lower
threshold.
4. The low
temperature alarm
threshold is
inappropriate.
5. The value
detected by the
temperature sensor
or temperature and
humidity sensor is
different from the
actual value.
6. The air filters are
blocked.
7. The chilled water
valve is stuck or
faulty.
1. Adjust the positions
of the temperature
sensors or temperature
and humidity sensors.
2. Contact Huawei
technical support.
3. Measure the
ambient temperature.
Check whether other
causes exist if the
alarm persists in a long
time after startup.
4. Adjust the low
temperature alarm
threshold.
5. Calibrate or replace
the temperature sensor
or temperature and
humidity sensor.
6. Maintain or replace
the air filters.
7. Maintain or replace
the chilled water valve.
A007
-01
MAJOR
Return air 2
temp/humid
sensor comm
failed
1. The cables to the
temperature and
humidity sensor are
loose or damaged.
2. The DIP switch of
the temperature
and humidity sensor
is set incorrectly.
3. The temperature
and humidity sensor
is faulty.
4. The
communications
port of the main
control board is
faulty.
1. Check the cables to
the temperature and
humidity sensor.
2. Set the DIP switch of
the temperature and
humidity sensor
correctly.
3. Maintain or replace
the temperature and
humidity sensor.
4. Maintain or replace
the main control
board.
NetCol8000-E220 Modular Indirect Evaporative
Cooling System
User Manual
6 System Operation and Maintenance
Issue 06 (2020-08-19)
Copyright © Huawei Technologies Co., Ltd.
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