Newbie to the forum.

I have a Cal Spa Genisis tub thats about 9 or 10years old.
Its a 220V AC with a 50amp GFCI. It has a single 2 speed motor, I believe its 4 hp. Don't know what type of controler it has.

All was well until a couple days ago when it started tripping the GFCI on low speed only. It will run on high speed but will trip the GFCI on the slow speed. I've tried with the heater both on and off with the same results.

Any ideas? The local Cal Spa service dept. had not heard of this type of issue.

Thanks
Rojo

Do you have an ozonator?
Try unplugging it