Mitsu EVSE Ground Fault

[bradleydavidgood777]

I have a 2017 Mitsu EVSE which is a Yazaki model 9482A128. It worked fine for about a year and now about half the time I plug it in I get a ground fault.

I've plugged it in several locations other than my house where I know there are good grounds and I get the same behavior.

I figured I'd try to open it up and check the wiring to see if it looks solid. I removed all of the screws and carefully used a screwdriver to pry it open but it is not opening easy.

Has anyone had any experience opening one of these?

Or any other advice?

Thanks

[kiev]

Did you remove the screws located under the labels?

[bradleydavidgood777]

Did you remove the screws located under the labels?

I peeled the label off the bottom of the unit and there were no screws. I have the newer model.

[bradleydavidgood777]

My EVSE:
https://imgur.com/a/gIBhUX5

[kiev]

i've never opened one of those, the Panasonic version has a potted control board and it is quite a pain to remove all the conformal coating without damage. i'm gonna guess that your board will be potted also.

The old version does 2 ground checks before allowing charging: one checks that the ground wire exists and provides a current flow path back for the Line; the other leaks a very low current thru the ground fault detection coil to prove that the GFCI circuit is functioning properly.