Alar
m ID
Alarm
Name
Alar
m
Sever
ity
Occurren
ce
Condition
s
Possible Causes
Solutions
a004 Return
-air
humid
invalid
Major The
humidity
exceeds
the
normal
rangeduri
ng normal
communic
ation, or
the
ambient
temperatu
re and
humidity
collection
board fails
to
communic
ate when
the alarm
detection
delay
expires.
1. Dirt or water exists
around the T/H
sensor, which leads
to a detection
fault.
2. The T/H sensor is
faulty.
1. Remove dirt
or water from
the T/H
sensor.
2. Maintain or
replace the
T/H sensor.
a007 T/H
board
comm
failed
Critic
al
The main
control
board fails
to
communic
ate with
the
temperatu
re and
humidity
collection
board
when the
alarm
detection
delay
expires.
1. The cables to the
T/H sensor are
loose or damaged.
2. The DIP switch of
the T/H sensor is
set incorrectly.
3. The T/H sensor is
faulty.
4. The
communication
port of the control
board is faulty.
1. Check the
cables to the
T/H sensor.
2. Set the DIP
switch of the
T/H sensor
correctly.
3. Maintain or
replace the
T/H sensor.
4. Maintain or
replace the
control board.
NetCol8000-A(050, 100) In-room Air Cooled Smart
Cooling Product
User Manual
7 System Operation and Maintenance
Issue 12 (2020-10-28)
Copyright © Huawei Technologies Co., Ltd.
158
