I just replaced the T-Cell 15 on my Hayward Salt System. At first, the board read r 1.59 with the power light on and the red no flow light on. I waited a couple of hours then pressed and held the small button. All lights came on and the small screen read pcb. The reason this whole thing started was that I shut off the filter during hurricane Irma. When I turned it back on I got a salt reading of 1900. I added salt and the reading went up to 4400. Now I'm thinking the whole system is shot. However, I read about replacing some parts yourself on the control board. So, I'm looking for help to troubleshoot and repair, if necessary, my Hayward SwimPure Plus (AQR-SWP) Salt System. Any help and advice would be greatly appreciated. TIA.