I am having some issues with my AquaPure 1400 salt cell. It was previously giving me some codes that the sensor was bad over the summer. I replaced this about a month ago and everything was fine. Now I am getting a 121 error. I have cleaned the cell numerous times and it is pretty clean. What is frustrating is that some days it works all day and others it codes and does not product chlorine all day. The cell is about three years old, but wanted to see if I could get through the winter if possible before buying a new cell. Your thoughts and help would be greatly appreciated.