Installed Jandy Aquapure last year and was so safisfied, other friends also installed the same system. Now having problems with "service" light coming on and no producing any chlorine. We have visually inspected the cell and no debris or scaling is seen. We have checked the power supply to the cell. Pool store has checked the water balance and we are ok there except for a 0 chlorine level. Our unit shows flow, we have it set on 80%, salinity level is 3.2. Any other suggestions before we try replacing the main circuit board that fixed anothers 123 code?