Alarm
ID
Alarm Name Alarm
Severity
Possible Cause Troubleshooting Suggestion
2012 String Current
Backfeed
Warning The number of PV
modules connected
in series to this PV
string is
insucient. As a
result, the end
voltage is lower
than that of other
strings.
Cause ID 1 = PV1
Cause ID 2 = PV2
Cause ID 3 = PV3
Cause ID 4 = PV4
1. Check whether the number of
PV modules connected in series
to this PV string is less than the
number of PV modules
connected in series to the other
PV strings connected in parallel
with this PV string. If yes, wait
until the PV string current
decreases below 0.5 A, set DC
SWITCH to OFF, and adjust the
number of PV modules in the PV
string.
2. Check whether the PV string is
shaded.
3. Check whether the open-circuit
voltage of the PV string is
normal.
2021 AFCI Self-Check
Failure
Major Cause ID = 1, 2
AFCI check fails.
Turn o the AC output switch and
DC input switch, and then turn
them on after 5 minutes. If the
fault persists, contact your dealer
or 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 lower impedance, and
rectify the fault.
2032 Grid Loss Major Cause ID = 1
● The power grid
experiences an
outage.
● The AC power
cable is
disconnected or
the AC circuit
breaker is OFF.
1. Check that the AC voltage is
normal.
2. Check that the AC power cable
is connected and that the AC
switch is ON.
SUN2000-(8KTL-20KTL)-M2
User Manual 8 Maintenance
Issue 11 (2023-02-07) Copyright © Huawei Technologies Co., Ltd. 96
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