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If turning the knob has no effect, your interface control board has failed. That is the only thing that would prevent you from changing the cycle cycle when you turn the knob. The cost of the part is almost $300 so I'm not sure how much you paid for it but this could get expensive really fast. The part number you'd need to order and replace is(###) ###-####and it's the board behind the front display where you push all the buttons.
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There is no possibility of anything else no. Without a doubt that is nothing bad but the interface control board.