Alarm
ID
Alarm
Name
Alarm
Severit
y
Possible Cause Suggestion
3809 Air
Conditio
ner
Compre
ssor
Fault
Major Cause ID = 1–13
1. [HVAC-No] The
cable of the
compressor is loose.
2. The compressor is
damaged.
1. Shut down the system at a proper
time and take security protection
measures.
2. Power o the air conditioner, open the
enclosure, and check whether the
compressor cable is loose. If yes,
securely connect the cable. Check
whether the compressor is damaged
or burnt. If yes, contact your technical
support.
3810 Air
Conditio
ner
Return
Air
Temper
ature
Sensor
Fault
Major Cause ID = 1–13
1. [HVAC-No] The
cable of the return
air temperature
sensor is loose.
2. The sensor is
damaged, open-
circuited, or short-
circuited.
1. Shut down the system at a proper
time and take security protection
measures.
2. Check whether any cable is loose.
3. Replace the return air temperature
sensor.
3811 Air
Conditio
ner
Supply
Air
Temper
ature
Sensor
Fault
Major Cause ID = 1–13
1. [HVAC-No] The
cable of the supply
air temperature
sensor is loose.
2. The sensor is
damaged, open-
circuited, or short-
circuited.
1. Shut down the system at a proper
time and take security protection
measures.
2. Check whether any cable is loose.
3. Replace the supply air temperature
sensor.
3812 Air
Conditio
ner
System
High
Pressure
Alarm
Major Cause ID = 1–13
1. [HVAC-No] The
outdoor heat
exchanger is
blocked or has
scale.
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.
LUNA2000-200KWH-2H1 Smart String ESS
Maintenance Manual 3 Alarm Reference
Issue 02 (2023-02-28) Copyright © Huawei Digital Power Technologies Co., Ltd. 30
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