Does the programmer move or make noises?

It could be one of four things
Faulty programmer (if it does not move or make noises)
Faulty Door lock, (try pushing the door firmly in)
The belt may be broken - If the belt is broken or come off of the wheel then you will be able to see this by removing the top. (always make sure that you remove the electrical plug before investigating)
The brushes on the motor could be worn down