I broke down and finally replaced my 10 year old T-15 With the compatible TurboCell T940 since I had a check cell on a lot last year and never could get it off in the week after open. I proceeded to break the collar coming from my filter and it had to be redone by a pro - an entire saga of 10 days waiting. So the pool has been running and I cleaned all the pollen from the filter and it looks great. Unfortunately the Hayward controller is showing 0 instant chlorine along with 2200 last reading, and the Check Salt and Inspect Cell are on. I bought a salt test kit while waiting for a repair on very good recommendation from this forum. That reads 3400ppm, so it 0 or 2200 from the cell! All instructions say the T940 is compatible and leave the Cell type at T-15. The other chemistry seems within normal after adding Baking Soda and Borax and 12.5% Chlorine. The pump has been running 24/7 for 4 days, but I am pro putting it on the timer tonight. Any ideas on what could be happening?