Alar
m ID
Alarm
Name
Alarm
Severity
Possible
Causes
Troubleshooting
2011 String
reverse
connect
ion
Major The PV string
polarity is
reversed.
Cause ID 1–4:
PV strings 1–4
Check whether the PV string is
reversely connected to the
inverter. If yes, wait until the
solar irradiance declines at night
and the PV string current drops
to below 0.5 A. Then, turn
o
the DC switch and correct the PV
string connection.
2012 String
current
backfee
d
Warning The number of
PV modules
connected in
series to the PV
string is
insucient. As
a result, the
terminal
voltage is lower
than that of
other strings.
Cause ID 1–4:
PV strings 1–4
1. Check whether the number of
PV modules connected in
series to the PV string is less
than that of other PV strings.
If yes, wait until the PV string
current drops below 0.5 A,
turn
o all DC switches, and
adjust the number of PV
modules in the PV string.
2. Check whether the open-
circuit voltage of the PV
string is abnormal.
3. Check whether the PV string
is shaded.
2021 AFCI
self-
check
failure
Major Cause ID = 1
The AFCI self-
check fails.
Turn o the AC output switch
and DC input switch, and then
turn them on after 5 minutes. If
the alarm persists, contact
Huawei technical support.
2031 Phase
wire
short-
circuite
d to PE
Major Cause ID = 1
The impedance
of the output
phase wire to
PE is low or the
output phase
wire is short-
circuited to PE.
Check the impedance of the
output phase wire to PE, locate
the position with low impedance,
and rectify the fault.
2032 Grid
loss
Major Cause ID = 1
● Power grid
outage
occurs.
● The AC
circuit is
disconnected
or the AC
switch is
o.
1. The alarm is cleared
automatically after the power
grid recovers.
2. Check whether the AC circuit
is disconnected or the AC
switch is
o.
SUN2000-(12K-25K)-MB0 Series
User Manual 7 System Maintenance
Issue 01 (2023-04-30) Copyright © Huawei Digital Power Technologies Co., Ltd. 89
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