Should a Single Phase Inverter go into Fault and display an F08 GDFI_Relay_Failure error message, first check that the Grid Type in Grid Mode settings is set to Single Phase and not 120/240V Split Phase. Setting to Single Phase should clear the F08 Fault and the Inverter can be rebooted from Battery Power only with AC and DC PV isolated. If the unit goes into 'Normal' state and the F08 has cleared, the AC and DC PV can now be restored. Check settings and check Power Flow for correct operation and functionality
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