I spoke to an RV repair shop today and he thought it would likely not be the control board. He did say that there is a chance it could be the board at the top of the fridge above the freezer, that has the buttons and indicator lights on it. He thought it could be defective or there could be a loose or pinched wire. So I pulled it off and it looked okay. I wiggled the wires and turned the fridge on again on 120. So far, about 6 hours later, the fridge is doing fine on 120V.
Maybe the connector to this board was loose? Guess we will just have to wait and see.
Gil & Deb & Dougal the Springer Spaniel