My pool, and all related equipment are about 6 years old. I did replace the salt generating cell for my Jandy Aquapure 1400 about two years ago from the square model to the circular model. Over the winter it is flushed and cleaned by my pool company. Now it is giving me additional problems. I first noticed a few days ago that it had an error code - service code 121. I inspected the cell and tried mechanically cleaning the cell by scraping away deposits - it wasn't too badly scaled but their was a bit of one buildup on a few of the plates. I put it back in and it was fine for a little while but then the service code 121 returned. Occasionaly I would get service code 120 which appears to be pretty much the same problem. I measured the voltage at the cell and it is too high at 39V - I get the same reading on the test points of the back board.
Today I noticed that it was throwing error codes 125 and 194 - which means cell needs to be cleaned or replaced and cell current is 85% lower than desired and cell voltage above 19V.
Should I clean the cell with acid, despite the fact that it doesn't look too bad? What kind of acid? Will vinegar do?