No AC connection
Error: 302
Check AC wiring.
Check the status of AC breaker
Utility grid frequency out of
permissible range.
Please switch off DC switch.
Check AC wiring, especially neutral and
ground wire.
Check grid frequency is complied with local
grid standard. Restart inverter, if problem
still exist, Contact Growatt.
Voltage of Neutral and PE above
30V.
1. Check the voltage of Neutral and PE.
2. Check AC wiring.
3. Restart inverter, if error message still
exisits,contact Manufacturer
Auto Test Failed
Error: 407
Restart inverter, repeat Auto Test, if
problem still exist, contact Growatt.