I have about a 15,000 SWG, Autopilot Digital Nano. For the past week the salt cell has not been producing chlorine. I took a water sample to a pool store when I noticed yellow algae building up on the walls and stairs, and to verify the strips were correct. I have zero chlorine in my pool. I cleaned the salt cell a couple weeks ago and re-inspected it again two days ago. The cell is clean and does not appear damaged. The whole system is just about three years old. I told the pool store that I ran the cell on boost mode for 24 hours prior to bringing in my sample. Since there was no chlorine in the water they stated I need a new cell. All the levels in my pool were perfect minus the chlorine. Since the cell is only three years old I did some more investigating and noticed that it read 2 volts, 5 amps, salt 3100, temp 85, output 100%. According to my the manual the volts are very low. Strange thing is the Autopilot has no error messages on it. Which is kind of strange seeing that the volts are really low. I have service person coming on Monday to look at the system but I'm wondering if anyone has any suggestions as to why I'm having this problem. I don't want to get taken by the service person telling me I need to buy a new system after only three years. I shocked the pool to remove the algae which has worked for now. Pool store says to shock the pool every week until I get a new cell.