9 Troubleshooting and Maintenance
9.1 Troubleshooting
Once the inverter fails, the fault information is displayed on the App interface. If the inverter is
equipped with an LCD screen, the fault information can be viewed on it.
The fault codes and troubleshooting methods of all PV inverters are detailed in the table below,
and only some of the faults may occur to the model you purchased. When a fault occurs, you
can check the fault information according to the fault code on the mobile app.
Fault Code Fault Name Corrective Measures
2, 3, 14, 15 Grid Overvoltage
Generally, the inverter will be reconnected to the
grid after the grid returns to normal. If the fault oc
curs repeatedly:
1. Measure the actual grid voltage, and contact the
local electric power company for solutions if the
grid voltage is higher than the set value.
2. Check whether the protection parameters are
appropriately set via the App or the LCD. Modify
the overvoltage protection values with the consent
of the local electric power operator.
3. Contact Sungrow Customer Service if the pre
ceding causes are ruled out and the fault persists.
4, 5 Grid Undervoltage
Generally, the inverter will be reconnected to the
grid after the grid returns to normal. If the fault oc
curs repeatedly:
1. Measure the actual grid voltage, and contact the
local electric power company for solutions if the
grid voltage is lower than the set value.
2. Check whether the protection parameters are
appropriately set via the App or the LCD.
3. Check whether the AC cable is firmly in place.
4. Contact Sungrow Customer Service if the pre
ceding causes are ruled out and the fault persists.
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