the control boards are not all that expensive from
http://www.dinosaurelectronics.com/Dom_boards.htmand my Dometic won't run on 120 a/c either.
nothing wrong with the burner, it works fine,
the problem according to all the tech talks I have read go straight to the control board.
when I removed the cover, I can see why, my 2004 year model is covered with corrosion everywhere. all the wires are white or green looking.... my Toy Hauler lived down in south Texas, and I'm quite sure the owner never once, did any maintenance on it at all.
Quite obvious when you get to looking around.
anyway, I am first going to remove the board, and give it a good bath with soapy water and a toothbrush.
let that air dry in the sun for a couple days, and clean every wire connector until it shines.
then if the controller don't work, will order up a new one.