In my fruitless efforts over the years and with various Dometic refers, to work better than an old fashioned ice-chest in the summer in the SW I fiddled with the control boards replacing some of them with Dinosaur boards. I've got a new Dino P-711 (P7109231) sitting on the self that indicates it is a replacement for Dometic with model or serial numbers above 285... Also have a Domentic control board with part number 3850712-01. Both are working boards. You might call Dino and check to see if they can confirm that the P-711 I have will work, if so let me know. Ditto on the Dometic board.