GE Dishwasher won't start

My dishwasher won’t start. The control panel is lit up fine, but the start button won’t work.

I found the 2012 GE Dishwasher Model Service Guide linked here:

http://pdfstream.manualsonline.com/c/c0c140df-0c49-4c4b-904f-9ff9d039ccd3.pdf

I realize mine is a newer model, but using the procedures in the manual, I was able to determine the door switch works - it knows when it is open and knows when it is closed. When checking for diagnostic error codes, it illuminates only the lock controls led

Can anyone help point me in the right direction to troubleshoot this?