I have an old tub of unknow mfg. It was leaking so I shut it down over the summer and fixed it up. The problem I am having now is that the GFCI trips when the thermostat turns the heat and pump off after reaching the set temp.

If I turn the t-stat up, everything turns on and it works. About 6 out of 10 times if I turn the t-stat back down, the GFCI will trip. The GFCI is in the control box on the tub.

I have a new T-stat, heater element and 2/3 of the plumbing. I put a new shaft seal in the pump so that was partially disassembled.

Any ideas would be appreciated.

Replace the trashy old GFI first; if it's a standard 20 amp or less rated blank face gfci, home depot or other cool hardware store will have them. If it's a big one with a wire loop on the back then this is what you need:

http://spapartsnet.com/Electrical-Parts ... 1_0_1.html

Never trust an old GFCI on an old tub.



If you replace this, and it still trips, then you'll need something else; at which point we're getting a bit experimental, either heater contactor/and-or/noise suppression device to control inductive kickback coming from it.

It's a Simple fix. But do the GFI thing first. When those things get old, they get ugly.

Thanks for taking the time out to answer my question. It was a simple 20 amp GFCI that the local HW store had. I replaced it and that seemed to do the trick.

Chuck