Huawei NetCol8000-C070 User Manual page 153

NetCol8000-C(070, 130, 190) In-room Chilled Water
Smart Cooling Product
User Manual
Alarm ID Alarm Name
A025-01 Return air filter
blocked alarm
Fresh air filter blocked
alarm
A027-01 Power loss alarm
A042-01 Remote shutdown
alarm
Issue 07 (2021-12-30)
Alarm
Severity
Warning
Warning
Critical
Copyright © Huawei Technologies Co., Ltd.
Possible Cause
● Air filters are
blocked or dirty.
● The differential
pressure switch is
faulty.
● An inappropriate
threshold is set for
the differential
pressure switch.
● The pressure tube
of the differential
pressure switch is
blocked or
disconnected.
● The cables to the
differential pressure
switch are loose or
damaged.
● The air damper for
the air filter is
faulty.
● The air damper for
the air filter is not
enabled.
The power supply is
cut off.
● The remote
shutdown dry
contact is triggered.
● The cables to the
remote shutdown
dry contact are
loose or damaged.
6 Maintenance
Solution
1. Maintain or replace
the air filters.
2. Replace the
differential pressure
switch.
3. Adjust the
threshold set for
the differential
pressure switch.
4. Dredge or replace
the pressure tube.
5. Check the cables to
the differential
pressure switch.
6. Maintain or replace
the air damper for
the air filter.
7. Enable the air
damper for the air
filter.
If power failure occurs
on the power system,
no maintenance is
needed. If it occurs in
other places, check the
power supply cables.
1. Check the status of
the remote
shutdown dry
contact.
2. Check the cables to
the remote
shutdown dry
contact.
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