Alarm
ID
Alarm
Name
Alarm
Severit
y
Possible Cause Suggestion
3818 Air
Conditio
ner
Ambient
Temper
ature
Sensor
Fault
Minor Cause ID = 1–13
1. [HVAC-No] The
cable is not
connected securely
or correctly.
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 ambient temperature
sensor.
3819 Air
Conditio
ner
Evapora
tor
Frozen
Minor Cause ID = 1–13
1. [HVAC-No] The air
intake or exhaust of
the cabinet is
blocked.
2. The indoor fan is
faulty.
3. The cooling system
cannot be shut
down in a timely
manner.
4. The evaporator
temperature sensor
is faulty.
1. Check whether the air intake or
exhaust vent is blocked. If yes, clean it.
2. If the fault persists, contact your
technical support.
3820 Frequen
t Air
Conditio
ner
System
High
Pressure
Alarm
Major Cause ID = 1–13
1. [HVAC-No] The
condenser is
blocked or has
scale.
2. The condenser fan
is faulty.
3. The external air
ow is short-
circuited or 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. 32
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