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96
Fault code Fault name Corrective measures
37
Excessively High Ambi-
ent Temperature
Generally, the inverter will resume operation
when the internal or module temperature re-
turns to normal. If the fault persists:
1. Check whether the ambient temperature of
the inverter is too high;
2. Check whether the inverter is in a well-ven-
tilated place;
3. Check whether the inverter is exposed to di-
rect sunlight. Shield it if so;
4. Check whether the fan is running properly.
Replace the fan if not;
5. Contact Sungrow Power Customer Service
if the fault is due to other causes and the fault
persists.
43
Excessively Low Ambi-
ent Temperature
Stop and disconnect the inverter. Restart the
inverter when the ambient temperature rises
within the operation temperature range.
39
Low System Insulation
Resistance
Wait for the inverter to return to normal. If the
fault occurs repeatedly:
1. Check whether the ISO resistance protec-
tion 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.
3. If the cable is normal and the fault occurs
on rainy days, check it again when the weath-
er turns fine.
4. Contact Sungrow Customer Service if the
preceding causes are ruled out and the fault
persists.
9 Troubleshooting and Maintenance User Manual