sanitized light does not light after completion of cycle after replacement of control board

I bought this unit about 4 years ago, about a year ago the sanitized light quit working, so I replaced the timer thinking it would correct the problem. I was wrong. The sanitize light still does not work so I bought another timer and just installed it to no avail. I have been on-line looking for solutions and can find no solution that works with my model. I bought this unit because at the time it offered the sanitizing rinse I was looking for to help keep my spreading of germs to my mom(a cancer patient at the time)from the public I deal with in the pharmacy I'm employed in. really upset that I can not get the sanitized option to work. The cleaning can not be beat. Love the dishwasher overall, but I want it to sanitize rinse my dishes and tell me it was done!