I had problems with my cell too. It seems like every 2 years they go bad. I got tired of paying money to get it replaced. I am an engineer, so I started studying how they work. It seems that the root of the problem is the temperature sensor at the cell. Check the temperature by pressing the button next to the display. Use a thermometer in the pool to check the water temperature. Is it off by more that 5 degrees? If it is, then you salinity will be wrong and it will call for more salt. The cell will shut down automatically. To overcome this situation I open my cell and cut the two wires on the side of the cell (red and blue). These are the temperature sensor wires. I installed an 8.5 K ohms resistor between the two wires. This will give you a forever temperature of 86 degrees. After that, the cell started working properly. Since I have a fixed temperature now I used salinity strips to keep track of the salt. This worked for me. If you want to do it, go ahead at your own risk. Other that this, there is no other way around it. I heard from other people having the same problem.