7.3 Troubleshooting
Contact your dealer if all failure analysis procedures listed above are completed and the
fault still exists.
Alarm severities are dened as follows:
● Major: The inverter is faulty. As a result, the output power decreases or the
grid-tied power generation is stopped.
● Minor: Some components are faulty without
aecting the grid-tied power
generation.
● Warning: The inverter works properly. The output power decreases or some
authorization functions fail due to external factors.
Table 7-2 Common alarms and troubleshooting measures
Alar
m ID
Alarm
Name
Alarm
Severity
Possible
Causes
Troubleshooting
2001 High
string
input
voltage
Major The PV array is
not properly
congured.
Excessive PV
modules are
connected in
series to the PV
string, and
therefore the
PV string open-
circuit voltage
exceeds the
maximum
inverter
operating
voltage.
● Cause ID 1:
PV strings 1
and 2
● Cause ID 2:
PV strings 3
and 4
Reduce the number of PV
modules connected in series to
the PV string until the PV string
open-circuit voltage is less than
or equal to the maximum
inverter operating voltage. After
the PV string
conguration is
corrected, the alarm disappears.
2003 DC arc
fault
Major The PV string
power cables
arc or are in
poor contact.
Cause ID 1–4:
PV strings 1–4
Check whether the PV string
cables arc or are in poor contact.
SUN2000-(12K-25K)-MB0 Series
User Manual 7 System Maintenance
Issue 01 (2023-04-30) Copyright © Huawei Digital Power Technologies Co., Ltd. 88
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