I have an Aqua Logic system. It is about 12 years old. I got a salt too low and chlorinator off message. I added salt. It did not go away so I added more salt. It still did not go away. I checked with local pool people and online and all indications was that the T-15 cell had finished it life. 12 years was a pretty good run. I ordered a replacement cell, not the original manufacturers replacement but the more economical brand. Now it is reading salt level too high and chlorinator off message. My online search for answers continued. I came across TFP and started reading some old posts with the same problem. They suggested re-soldering a burned spot on the back of the mother board. I did. I did it three times still the same readings. The actual salt level in the pool is about 2600 ppm (strip tested). Am I supposed to do something else to that spot on the back of the mother board other than heat it up and add some solder to it? What can I do now? I hope some out there has a solution. Thank you from Savannah, GA. Carhub