So, I’m back. Talked to Appliance Part Pros and the voltage from the main board seemed low on the replacement. They sent me another after about a month of waiting and I installed it, but still nothing with either ‘new’ UI board I received, so I tried the original UI board and the dishwasher started working. I did try this original UI board with both of the other main boards and it did not work.
I had a local appliance repair guy say that if the UI board isn’t configured correctly (mine has no dip switches, as they are ‘preconfigured’) then they won’t do anything. Both board are part number:
WD21X31904. Could they both be bad? I’m running a test cycle no with the 2nd main board replacement and it seems to be working for now.