Hi, thanks for answering, Kenny.
The breaker trips very seldom, 1 or 2 times a month, never when I'm out there, and the way I find out about it is when I go to use the spa; the water is not hot.
The GFI is inside, and it runs out to a cut off next to the unit. All Cutler-Hammer boxes and breakers. I have not had the electrician to check everything out, I'llhave to do that, and know a good guy. He can also check the current draw.
I'll also unhook the heater, the ozonator etc one at a time and see what happens.
The spa is about 8+ yrs old, made by Vita Spa, model L780C, but I don't know who made the controls. I'll look in the box and see. I do know that the control box has Vita printed on it, but don't know if they made the circuit board.
Thanks for your thought,
Dave