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9 Troubleshooting and Maintenance
Fault Code
39
106
88
100
Fault Name
Corrective Measures
Wait for the inverter to return to normal. If the
fault occurs repeatedly:
1. Check whether the ISO resistance protection
value is excessively high via the app or the LCD,
and ensure that it complies with the local
regulations.
2. Check the resistance to ground of the string
and DC cable. Take corrective measures in case
of short circuit or damaged insulation layer.
Low System Insu-
3. If the cable is normal and the fault occurs on
lation Resistance
rainy days, check it again when the weather turns
fine.
4. If there are batteries, check whether battery
cables are damaged and whether terminals are
loose or in poor contact. If so, replace the dam-
aged cable and secure terminals to ensure a reli-
able connection.
5. Contact Sungrow Customer Service if the pre-
ceding causes are ruled out and the fault persists.
1. Check whether the AC cable is correctly
connected.
2. Check whether the insulation between the
Grounding Cable
ground cable and the live wire is normal.
Fault
3. Contact Sungrow Customer Service if the pre-
ceding causes are ruled out and the fault persists.
1. Disconnect the DC power supply, and check
whether any DC cable is damaged, the connec-
tion terminal or fuse is loose or there is a weak
contact. If so, replace the damaged cable, fasten
the terminal or fuse, and replace the burnt
component.
Electric Arc Fault
2. After performing step 1, reconnect the DC
power supply, and clear the electric arc fault via
the App or the LCD, after that the inverter will re-
turn to normal.
3. Contact Sungrow Customer Service if the fault
persists.
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