Maybe this is not the right forum?
I bought a Metcal MX500P to replace my PS900. I finally got around to plugging it in today and it gives me an error that says GND Fault. I looked it up and it looks like maybe my outlet may not be grounded correctly. This particular unit says, in the manual, that if your outlet is not grounded, it will just shutdown (that was not the case with the PS900). Seeing as how I live in a 120 year old house, I would not really be surprised that the previous owners put a grounded outlet in a non grounded line (that would actually not be the worst thing they did in this house, but those stories are for another day). Before I go crazy and attempts to replace the line (that is gonna be a pain in the a**!), do you think it would be feasible to replace the outlet with a GFCI outlet? Or would that not fix the issue? I tried this on an outlet that I actually installed myself, and the unit itself does work, so I am sure at this point that it is indeed the outlet.