I acquired this spa, wired it up and it shows iloc. It is a sentry 850. I read that this is possible ozone spike or pump spike. Where do I start to find the problem? What does this mean?The schematic on the door of the hottub shows a circ pump, but there is not one wired in the spot where it goes. It may have been taken out before I got it. The door does not seem to have a switch on it either for it to be closed. Any help would be appreciated.