Is it possible to have a bad cell without getting any error messages? I am rapidly losing chlorine while running 100% 12 hours/day. I have also been adding bleach, but still losing chlorine at a rapid pace. I am currently shocking. If that doesn't work, Jandy guy wants me to take water sample at salt cell (after the pool loses all of it's chlorine) to help determine if the cell is producing or not. I will post a complete set of #'s tomorrow.