Alarm
ID
Alarm
Name
Severity Possible Cause Suggestion
3809 Air
Condition
er
Compress
or Fault
Major Cause ID = 1–13
1. The fan cable of
[HVAC-No] is loose.
2. The fan is damaged.
1. Shut down the system at a
proper time and take safety
measures.
2. Power o the air conditioner,
open the enclosure, and check
whether the compressor cable is
loose. If yes, connect the cable
securely. Check whether the
compressor is damaged or burnt. If
yes, contact your technical support.
3810 Air
Condition
er Return
Air
Temperatu
re Sensor
Fault
Major Cause ID = 1–13
1. The cable to the
return 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 return air
temperature sensor.
3811 Air
Condition
er Supply
Air
Temperatu
re 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
Condition
er 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.
LUNA2000-2.0MWH Series Smart String ESS
User Manual 10 Alarm Reference
Issue 08 (2022-11-15) Copyright © Huawei Technologies Co., Ltd. 179
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