Check the remote fuse. I had the same problem when we first got ours. If you stand directly in front and look at the front of the camper there are the two rails under the propane bottles that form the v behind the hitch. There is a fuse holder that runs along the right rail. Lay on the ground and follow the right one along the underside. There will be a small rubber red fuse holder the blown fuse will probably be in that. It just pulls open and should have the blown fuse. That was a really stupid location, and that is where I found my culprit. It was a quick one minute fix.
2008 Rockwood 8318
GMC 3500 Crew Cab Dually Diesel