Ok, If the machine control board STATUS LED is STEADY ON--->UI personality not set, communications lost between UI and MC.
Unusually that means the UI Board is the problem. The UI Board is at the top of the dishwasher door, where you press the buttons to set the cycles and start the machine.
If you want to verify that--->You will need a
multimeter to check for 13.5 Volts DC.
The UI operational voltage is output from the main control board on connector J722 pin 2 black/green to pin 5 yellow/blue. If 13.5 Volts DC is found here, then the UI Board is the problem.
Here's the UI(user interface) Board for your model you can order:
WD21X23462 Kit Svc Ui Top Logic
Connector J722 is located on the metal casing side of the main control board.
It's the one on the left above the ethernet port.
Let us know what you find.
Jake