NetCol5000-A 42 kW Air Cooled In-row Precision Air
Conditioner
User Manual
5 Operation and Maintenance
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
PSU 1
comm
interrupt
PSU 2
comm
interrupt
1. The communication
cables of the PSU are
faulty.
2. The PSU is faulty.
3. The communication port
of the control board is
faulty.
1. Check the
communication cables of
the PSU.
2. Maintain or replace the
PSU.
3. Maintain or replace the
control board.
Discharge
temp
sensor
fault
1. Cables to the exhaust air
temperature sensor are
not properly connected.
2. The discharge
temperature sensor is
faulty.
1. Check cables to the
exhaust air temperature
sensor.
2. Maintain or replace the
exhaust air temperature
sensor.
Discharge
pressure
sensor
fault
1. The cables to the press
sensor are loose or
damaged.
2. The press sensor is faulty.
1. Check the cables to the
press sensor.
2. Replace the press sensor.
The alarm
is
generated,
and the
compresso
r shuts
down.
1. The outdoor unit input
power has an open phase,
incorrect phase sequence,
or is unavailable.
2. Signal cables to the
outdoor unit are not
properly connected.
3. The condenser fins are
blocked.
4. The outdoor fan driver or
fan is faulty.
5. The press displayed is
different from the actual
press.
6. The refrigerant is
overfilled.
1. Check the power supply
of the outdoor unit.
2. Check the signal cables to
outdoor unit.
3. Clean the condenser fins.
4. Maintain or replace the
outdoor unit or unit
driver.
5. Calibrate or replace the
press sensor.
6. Decrease certain amount
of refrigerant.
The alarm
is
generated,
and the
compresso
r shuts
down.
The a057 comp discharge
HP alarm is generated
frequently.
Reference to the solutions
for the a057 comp discharge
HP alarm.
Suction
pres
sensor
fault
1. The cables to the press
sensor are loose or
damaged.
2. The press sensor is faulty.
1. Check the cables to the
press sensor.
2. Maintain or replace the
press sensor.
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