When trying to start the dishwasher to run a cycle, the "normal wash" button would not start the wash. After repeated tries of pushing numerous buttons, the light wash cycle started. At the end of the cycle (the dishes were clean), all the lights on the panel were turning on and off in a running circular pattern without any involvement on our part. It was counting down from 50 to 0 and it repeated this at least twice. Then the "lock" light went on and it will not unlock. I pressed the "heated dry" button for 3 seconds and it would not restart. I turned off all power to the dishwasher for 20 minutes and that still did not reset the lock button which shows the "L" symbol. I am pretty confident with any repairs needed for this dishwasher. Could you please suggest a correct part for us? Thanks.