my Bosch washing machine selector dial broken?

When you turn my selector dial it lets you select a program, and then the dial will not move again to progress it through the wash - I can do it manually - but if I choose, say program 1 it performs the first part of the program and then just sits there. You then have to turn the dial yourself to the next stage. Help! I cannot afford a new washing machine! Any suggestions?

Charlie
January 2009