Alarm
ID
Alarm Name Alarm
Severity
Possible Causes Troubleshooting
● ID7: When the sunlight
is normal, perform the
optimizer search
function again.
● ID8: When the sunlight
is normal, perform the
optimizer search
function again.
● ID9: Calculate the PV
string voltage based on
the number of PV
modules in the PV string
and check whether the
PV string voltage
exceeds the upper
threshold of the inverter
input voltage.
2081 Optimizer Fault Warning Cause ID = 1
An optimizer is faulty.
Go to the optimizer
information screen to view
the fault details.
2082 Grid-tied/O-
grid Controller
Abnormal
Major Cause ID = 1
The inverter fails to
communicate with the
Smart Backup Box.
Cause ID = 2
An unrecoverable fault
occurs on a circuit inside
the Smart Backup Box.
1. Send a shutdown
command on the app.
Turn o the AC output
switch, DC input switch,
and battery switch.
2. Check whether the
power cable and RS485
cable between the
Smart Backup Box and
the inverter are normal.
3. After 5 minutes, turn on
the battery switch, AC
output side, AC output
switch, and DC input
switch.
4. If the alarm persists,
contact your dealer or
Huawei technical
support.
Contact your dealer if all failure analysis procedures listed above are completed and the
fault still exists.
SUN2000-(2KTL-6KTL)-L1
User Manual 8 System Maintenance
Issue 04 (2021-04-01) Copyright © Huawei Technologies Co., Ltd. 94
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