If I understand your post it does not work on electric and will not work on propane either if you put it on auto? is that correct? Does it try to light on propane do you hear a clicking see a flame then it goes out? What model Norcold do you have? Is there any cooling in the freezer section? Are you getting 110v where the Norcold plugs in? I would bypass the control board and connect the heater element directly to 110v and see if it gets cold. If it does you know your cooling unit still works and the problem is in the electric circuits or the control board which would be cheaper to fix than buying a new cooling unit. It might be as simple as a bad connection in the circuits from the controls to the board itself.