This Tip ‘O Da Day applies to newer KitchenAid dishwashers with model numbers like KUDI02FR.
The flashing Lock light problem is caused by a stuck key on the touchpanel console.
If the control board detects that a key is stuck in the “mashed-in” position, then the dishwasher will suspend operation and maddeningly flash the light for that key until the condition is fixed. If a key without a light is stuck or multiple keys are stuck, the control will flash the Lock light.
The cure is to replace the touchpanel console. Easy job and, conveniently, here’re the part links. Click it to git it, Hoss:
To learn more about your dishwasher, or to order parts, click here.