My Hoover washer dryer is stuck on programme?

My Hoover washer dryer 1300 starts off on a program as normal but after it fills, the program doesnt move on. This means the pump wont drain the water and keeps filling up till it overfills. There seems to be a problem with the programmer as it keeps making a buzzing sound, like it is trying to go on the next cycle. When i move the dial to spin, it drains the water out so the pump is working. Any ideas?