There are several things you might want to check. First, make sure the cell is actually plugged into the front of the control panel. Then go into the "settings" menu. Make sure the cell is set to some value other than "off". Try something high like 90%. Then go into the "diagnostic" menu. Make sure the flow swith says "flow". Bad flow switch and cell will not turn on. Keep hitting the right arrow button until you get to the cell menu. If the cell is on, it will give you the current amps and voltage the cell is drawing, along with the current salt level. If it's not on, hit the up arrow at this point. This will either turn the cell on or begin a count down (usually 15 seconds) to turn on chlorinator. If/when this happens you will get voltage/amp and salt reading. If not, you may have a bigger problem. Also, if you manually toggle the chlorinator on and off via the menu, you will actually hear it begin to draw current from the board. Hope this helps.