Programme Selector on Hoover600mb not working automatically?

Washing Machine works fine, but I have to turn the selector manually. I have tried to fix, it appears that one of the blue plastic/nylon cogs is not turning...but unable (at the moment) to get into that part. Is this the problem, and if so can you get these parts (cogs and springs etc) separately? I live in Melbourne. Machine is only 2 1/2 years old.