Huawei LUNA2000-2.0MWH Series User Manual page 190

LUNA2000-2.0MWH Series Smart String ESS
User Manual
Alarm Alarm
ID Name
3813 Air
Condition
er AC
Overvolta
ge
3814 Air
Condition
er AC
Undervolt
age
3815 Air
Condition
er AC
Power
Failure
3816 Air
Condition
er
Evaporato
r
Temperatu
re Sensor
Fault
Issue 08 (2022-11-15)
Severity Possible Cause
Major Cause ID = 1–13
1. The auxiliary power
cable is incorrectly
connected.
2. The main control
board of [HVAC-No] is
faulty.
3. The overvoltage alarm
threshold is incorrect.
Major Cause ID = 1–13
1. The power cable of
HVAC-No1] is loose.
2. The model of auxiliary
power supply is
incorrect.
3. The main control
board is faulty.
4. The undervoltage
alarm threshold is
incorrect.
Major Cause ID = 1
1. The power supply
device is faulty or
disconnected.
2. The power supply
circuit is
disconnected.
Minor Cause ID = 1–13
1. The cable to the
evaporator temperature
sensor on [HVAC-No] is
loose.
2. The sensor is
damaged, open-
circuited, or short-
circuited.
Copyright © Huawei Technologies Co., Ltd.
10 Alarm Reference
Suggestion
1. Measure the voltage of the air
conditioner wiring terminal. If the
voltage is approximately 380 V, the
auxiliary power cable is incorrectly
connected. In this case, disconnect
the auxiliary power supply and
reconnect the cable correctly.
2. If the voltage is approximately
220 V, contact your technical
support.
1. Measure the voltage of the air
conditioner wiring terminal. If the
voltage is approximately 110 V or
127 V, the model of the auxiliary
power supply is incorrect. In this
case, disconnect the auxiliary power
supply immediately and replace it
with a 380 V power supply.
2. If the voltage is less than 150 V,
check whether the cable is loose.
3. If the voltage is approximately
220 V, contact your technical
support.
1. Check the voltage of the input
power supply and the power
supply device.
2. Check whether the power supply
circuit is abnormal.
3. If the fault persists, contact your
dealer or technical support.
1. Shut down the system at a
proper time and take safety
measures.
2. Check whether the cable is loose.
3. Replace the evaporator
temperature sensor.
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