Kenmore starts, quits, washing light blinks

My two year old Kenmore Elite dishwasher (665.13269K114) starts up and runs for a few minutes and stops. Then the Washing light begins to flash and beep continuously until I open the door. Hitting cancel pumps out the water left behind. I’ve tried opening the door and pushing Normal Wash and Heated dry repeatedly to reset the panel but it does not light up as expected.

I got a two year old Kenmore Elite dishwasher (665.12772K311) that does the same thing.
I am coming up empty finding help on the web.
Anyone got anything?

I found that I can enter the Diagnostic mode by pressing any three keys in series three times. After it runs through the test, the Normal Wash and High Temp lights blink continuously. What’s it trying to tell me?