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Error 407
Growatt
Error 407
Auto Test Failed
Grid connection self-test (G98/G99 type test simulation) has failed.
Common causes
Grid parameters at time of test were out of range
AC wiring fault
Grid relay issue
What to check
STEP 1
Check grid voltage and frequency are stable. Retry power cycle and allow inverter to run self-test again
STEP 2
Check AC wiring is correct and secure
Escalate if
Auto test fails repeatedly despite stable grid — escalate
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Error 300
AC Voltage Out of Range