Hi Chris
I know that when the dial just keeps clicking around it's a block in the out pipe, however, I'm searching this forum for some hope of a service manual.
Best thing for you to do is strip down from the back of the maching, the waste pipe, if clear, you'll have to venture in the U bend and see if it's in the pipe. If not, you're in the samre boat as I am. I
Mine is in the bl**dy machine at the moment and no idea where to start!
Hope this helps.
Cheers
Ryan
Ryan youle, January 2007