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8
Troubleshooting and Maintenance
8.1 Troubleshooting
Once a fault occurs in the optimizer, the fault information is displayed on the App.
Fault
Code
Fault
Name
Possible
Cause
Corrective Method
4
Input
overvol-
tage
The output
voltage of
PV mod-
ules is
greater
than the in-
put voltage
of the
optimizer.
1. Measure whether the open circuit voltage of PV
modules exceeds the input voltage of the
optimizer.
2. Check whether modules are connected in
series.
3. If the fault is not caused by the foregoing rea-
sons and still exists, contact Sungrow Customer
Service.
32
Overtem-
perature
alarm
The ambi-
ent tem-
perature is
excessive-
ly high or
the optimi-
zer is in-
stalled im-
properly.
1. Check whether the ambient temperature of the
device is too high.
2. Check whether the device is in a well-ventilated
place.
3. Check whether the device is exposed to direct
sunlight. Shield it if so.
4. If the fault is not caused by the foregoing rea-
sons and still exists, contact Sungrow Customer
Service.
16
Output
overcur-
rent
The optimi-
zer output
circuit is
short-
circuited.
1. Power down the system, unplug input cables
and output cables of the optimizer 5 minutes later,
then restore the input wiring and output wiring 1
minute later, and then power up the system.
2. If the fault is not caused by the foregoing rea-
son and still exists, contact Sungrow Customer
Service.
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