Sounds very familiar, my Advent A/C on my 14 month old camper went out on the first day of a seven day vacation. It had worked fine every other trip. Needless to say it was a weekend and only blew warm air. Called a mobil guy who couldn't get to it til Sunday ( Mothers Day ). After checking it out we were told it needed to be replaced. It was in the upper 80 s in Florida so I had him replace it and Id fight with ASA electronics the makers of Advent when I got home. Here it is 3 weeks later and I'm still fighting with them. Needless to say it cost me a pretty penny to get my A/C replaced. Good luck and by the way I would not buy anything made by ASA electronics.