Alarm
ID
Alarm
Name
Alarm
Severit
y
Possible Cause Suggestion
3811 Air
Conditio
ner
Supply
Air
Temper
ature
Sensor
Fault
Major Cause ID = 1–13
1. The cable to the
supply air
temperature sensor
on [HVAC-No] is
loose.
2. The sensor is
damaged, open-
circuited, or short-
circuited.
1. Shut down the system at a proper
time and take safety measures.
2. Check whether the cable is loose.
3. Replace the supply air temperature
sensor.
3812 Air
Conditio
ner
System
High
Pressure
Alarm
Major Cause ID = 1–13
1. The outdoor heat
exchanger of
[HVAC-No] is
blocked or has scale
buildup.
2. The outdoor fan is
faulty.
3. The air intake or
exhaust vent of the
outdoor fan is
blocked.
1. Check whether the outdoor heat
exchanger is blocked by dirt. If yes,
clean it using a high-pressure water
gun.
2. Check whether the outdoor fan is
running properly. If not, replace it.
3. Check whether the air intake or
exhaust vent of the outdoor fan is
blocked. If yes, clean the air intake or
exhaust vent.
4. If the fault persists, contact your
technical support.
3813 Air
Conditio
ner AC
Overvol
tage
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.
1. Check that the AC overvoltage alarm
threshold is set to a proper value. The
default value is 264 V.
2. If the preceding threshold is set
properly, 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.
3. If the voltage is approximately 220 V,
contact your technical support.
LUNA2000-200KWH-2H1 Smart String ESS
User Manual 13 Alarm Reference
Issue 03 (2023-03-30) Copyright © Huawei Digital Power Technologies Co., Ltd. 153
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