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GFCI Self Test Failed

I have a 2019-vintage, GoPlug-branded, OpenEVSE that has started raising “GFCI Self Test Failed” on restart or power cycling, after raising the same error a couple of times when the EV was first connected. I have not tried turning off the self-test, or opening up the unit. It’s running v2.9.1 wifi software.
It did log one GFCI fault when first installed in July, 2019. I don’t know what the electrician did to cause that.
We did get the household service panel replaced in January.
RAPI $GV returns >$OK 1.0.0 4.0.1^24

If the unit has been installed via an RCD you can safely turn off the GFCI. Or you could try replacing the GFCI sensor:

Thanks. I ordered a replacement GFCI sensor.

And the replacement sensor fixed the problem.