Check and see if the GFCI outlet by the side dinette is tripped. If it is, everything past the outlet on that side of the camper will be out as well. The other side of the unit, including the microwave
is protected by the GFCI outlet by the side of the stove, so you can have AC on one side of the trailer and not on the other. We ran in to a similar problem last year on our first night on our way home from Gibsonville. The microwave
wouldn't work and we realized that the refrigerator
would not operate on AC. The GFCI outlet by the stove was tripped and would not reset. I assumed the GFCI was bad and ran an extension cord from the street side to the microwave to heat dinner and switched the refrigerator
for the night. The next day I drove to a local hardware store and purchased a new GFCI outlet and replaced the original. Same problem. I started disconnecting things downstream of the GFCI outlet until the reset held. Turned out that the outlet for the microwave was connected to the romex using the push in quick connects on the outlet. I switched the wires to the side screws and everything held and has been fine ever since. I left my new ivory GFCI outlet and cover plate installed as a memory of the first evening's fun. Oh, and I carry the original white one as a spare. Hopefully, your solution will be simpler and just pressing the reset button on the GFCI outlet will solve the problem.
Best of luck. BTW, once we got back within cell phone range, I called ParkLiner
and told Chandler that he ought to consider checking every outlet before a unit rolls off of the loading dock. I'm guessing that may still not be happening in every case.