Won't begin cycle automatically

Will not advance from end cycle to begin new cycle automatically. Cycle complete light will not turn off. Must turn timer manually. I have replaced timer & the door lock switch as all trouble shooting guides indicate it is one or the other that is most likely the cause. Does not fix the problem. Works through all cycles once you advance timer to heat water cycle. Any ideas what is causing the end cycle light not to turn off when you open the door or the timer not to advance to the start position.