ID Name Severity Cause Solution
2011 String
reverse
connecti
on
Major The PV string polarity is
reversed.
Cause ID 1–8: PV strings 1–
8
1. Check whether the PV string
is connected to the device in
reverse polarity. If yes, wait
until the PV string current
decreases to below 0.5 A, set
DC SWITCH to OFF, and
adjust the PV string polarity.
2. If the fault persists, reset the
device on the local
maintenance app or WebUI
of the upper-layer controller.
Alternatively, you can turn
o
the AC and DC switches, wait
for 5 minutes, and then turn
on the AC and DC switches.
2012 String
current
backfeed
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 1–8: PV strings 1–
8
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, 2
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-
circuited
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-(20KTL, 29.9KTL, 30KTL, 36KTL, 40KTL)-
M3
User Manual 8 Maintenance
Issue 11 (2023-01-10) Copyright © Huawei Technologies Co., Ltd. 75
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