My Swimpure plus a -15 cell and is three years old. I replaced the current limiter once. Lately, it stops generating due to low salt. I have cleaned the cell, had the salt checked at two pool stores and have done my own test. The salt is at 3400ppm. When I reset the controller to 3400, it reverts to a low number (2600) less that 12 hrs later. After much web surfing, I may have found the problem. The Hayward website says that there should be eight different readings when cycling through the diagnostic switch. I get eight but do not get the "T-xx" information. Here is what I get. 86/32.8/0.00/57P/0/AL-0/r1.45/2700.