At wits end with KitchenAid Dishwasher

At wits end with KitchenAid Dishwasher

I have a KitchenAid Dishwasher kdte104ess2. It does not spray water through arms. When I run diagnostic then it comes up with a 6-4 code. I have checked float switch and all seems fine. Fill with water and drains fine. Once in a while it will run properly with spray arms running. 9out of ten it just fills, heats and drains. With nothing in between. Checked for clogs as well and nothing. Could it be control panel or something else ?!?!?!?! HELP PLEASE.