Alarm
ID
Alarm
Name
Alarm
Severit
y
Possible Cause Suggestion
3821 Air
Conditio
ner DC
Overvol
tage
Major Cause ID = 1–13
1. [HVAC-No] The
input voltage is
higher than the
overvoltage
threshold.
2. The overvoltage
threshold setting is
improper.
3. The voltage test
device is faulty.
Measure the voltage of the air
conditioner power supply, record it, and
contact your technical support.
3822 Air
Conditio
ner DC
Undervo
ltage
Major Cause ID = 1–13
1. [HVAC-No] The
input voltage is
lower than the
undervoltage
threshold.
2. The undervoltage
threshold setting is
improper.
3. The voltage test
device is faulty.
Measure the voltage of the air
conditioner power supply, record it, and
contact your technical support.
3825 UPS
Alarm
Major Cause ID = 1
A UPS alarm has been
generated.
Troubleshoot the fault by referring to the
alarm troubleshooting section in the UPS
user manual.
LUNA2000-200KWH-2H1 Smart String ESS
Maintenance Manual 3 Alarm Reference
Issue 02 (2023-02-28) Copyright © Huawei Digital Power Technologies Co., Ltd. 33
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