Is it me, or does the pool act up during the most inclement weather..?
Had a cold snap here, and when the spa took its turn during a freeze protection cycle, the spa drained down (level to the pool's water line). I turned the spa off and back into pool mode, and the spa fills up in short order.
I've read that a bad check valve can cause this, so I pulled the cover and paddle (Jandy) out of its housing. It did look like the rubber gasket on the paddle wasn't in the best of shape; pulled the one from the water fountain check valve (which looked better), and swapped them. No change - spa continues to drain when everything goes into spa mode. Should I go ahead and replace the check valves with a rebuild kit? The pool is about 13 years old, and I don't think I've ever replaced any of the valve diverters (only the o-rings to fix a valve leak), but I've never replace either of the check valve paddles...
The actuators all seem to work in unison the way they always do when cycling between spa and pool mode. Could the check valve springs I've attached a diagram of my equipment configuration in hopes that someone can give me some ideas.