Alarm
ID
Alarm
Name
Alarm
Severit
y
Possible Causes Suggestions
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 lower
impedance, and rectify the
fault.
2032 Grid
Loss
Major Cause ID = 1
1. The power grid experiences an
outage.
2. The AC circuit is disconnected
or the AC switch is o.
1. Check the AC voltage.
2. Check whether the AC
circuit is disconnected or
the AC switch is o.
2033 Grid
Undervo
ltage
Major Cause ID = 1
The grid voltage is below the
lower threshold or the
undervoltage duration exceeds
the time that triggers low voltage
ride-through (LVRT).
1. If the alarm occurs
occasionally, the power
grid may be abnormal
temporarily. The solar
inverter automatically
recovers after detecting
that the power grid
becomes normal.
2. If the alarm occurs
frequently, check whether
the power grid voltage is
within the acceptable
range. If not, contact the
local power operator. If yes,
log in to the mobile app,
SmartLogger, or network
management system
(NMS) to modify the grid
undervoltage protection
threshold with the consent
of the local power
operator.
3. If the fault persists for a
long time, check the AC
circuit breaker and AC
output power cable.
SUN2000-(75KTL, 100KTL, 110KTL, 125KTL) Series
User Manual 8 Maintenance
Issue 11 (2021-11-10) Copyright © Huawei Technologies Co., Ltd. 114
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