Control board malfunction

My Kitchen Aid KUDS01DJSS0 dishwasher takes about 2 or 3 hours to complete a cycle, so I replaced the control board. Now the DW ran one cycle and then stopped working with the "clean" light blinking 7 times then pausing and repeating. I got the dealer to send me another control board, but it did the same thing; one cycle then blinking lights with no action. However, I am able to cancel the cycle using the cancel button no matter what board I use. I then replaced the touch panel thinking there was either a stuck key or a short. Nothing changed. I then replaced the original board back in and the unit runs, but it takes 2 to 3 hours to complete a cycle just like the original problem. I’m wondering if the touch panel damaged the control board, but now that I have a new panel, a new board would fix the problem.