My SwimPure Plus system is 7 years old and has been working just fine. Original cell has tested good twice in the last couple of months; I am meticulous about cleaning and acid washing. Salt is about 3000. T-15 cell running about 50-60% in summer.
About a month ago I tested the water and chlorine was pretty much zero; usually it is near 5. Cleaned and acid-washed cell, then took to Leslie for test. Cell tested "good," just as it had a couple of months earlier. Put everything back together and started pump.
With panel switch to "Off" I wait until No Flow light goes off. Bring display to instant salt reading (says 0) and set unit to "Auto." After a few seconds the unit clicks and instant salt reading jumps to very high number, then rolls down to about 3100. That number stays up for a few seconds then starts going down - 2800-2500-2000-1500-0. The countdown takes less than 10 seconds once it starts. At that point the Generating light goes off. I can shut power off, back on, reset instant salt, and the same thing will happen.
I called Hayward this morning and was told to call a pool company. About all the guy would say was that it was "probably" something in the panel electronics. I called Hayward a couple of years and they were much more helpful; something has changed.
So - my considerable research points to one of the two boards in the panel, but which one?