Alarm
ID
Alarm
Name
Severity Possible Cause Suggestion
3851 Exhaust
Fan Fault
Major Cause ID = 1–12
The exhaust fan is
faulty.
1. Check whether the cable to the
exhaust fan is loose. If yes,
reconnect the cable. Check whether
the fan is damaged or burnt. If yes,
replace the fan.
2. Check whether the TCU
connected to the exhaust fan works
properly.
3. If the fault persists, contact your
technical support.
3852 Ambient
Temperatu
re Low
Major Cause ID = 1
The ambient
temperature in the
battery cabin is too low.
1. Check whether the air
conditioners in the battery cabin
are faulty.
2. Check whether the doors of the
battery cabin are completely closed.
Cause ID = 2
The ambient
temperature in the
control unit cabin is too
low.
1. Check whether the air
conditioners in the control unit
cabin are faulty.
2. Check whether the doors of the
control unit cabin are completely
closed.
3853 ESU
Physical
Location
Failure
Minor Cause ID = 1
ESU physical location
failed.
1. Check whether the network
connections between the ESCs are
normal.
2. Check whether the network
connections between the CMU and
the
rst and last nodes of the ESC
are normal.
3. Check whether the RS485 cable
between ESC-1 and the CMU is
properly connected.
3856 Battery
Fault
Protection
Major Cause ID = 1
Some battery packs are
severely faulty, causing
the system to shut
down.
Maintain the battery pack based on
the alarm and troubleshooting
suggestions.
Cause ID = 2
The temperature of
some battery packs is
too low. As a result,
charge capacity is not
reached due to low
temperature protection.
LUNA2000-2.0MWH Series Smart String ESS
User Manual 10 Alarm Reference
Issue 08 (2022-11-15) Copyright © Huawei Technologies Co., Ltd. 188
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