Hi I am installing a new to me spa. I grounded the circuit at the main panel and installed the tub subpanel with gfi. I wanted to test my work before I hooked up the tub, and no dice. Even without any load, without even wires hooked up, it wouldn't stay on. So I thought, okay, there's a fault in my panel somewhere. So I isolated the ground and neutral, giving the subpanel its own local ground and taking it off the main panel ground/neutral. The ground is a normal 8ft ground rod fully driven. No dice. Still trips. What to do? It can't be the new gfi--can it? And if the subpanel ground bar is only hooked to ground and nothing else...how could there be a fault?

Tia, Dumbfounded...

I think I may have discovered the prob. Was a new ground rod and now that we've got some rain it seems to be staying on and tests okay. Could this be it?