Bedroom a/c dead

Thanks for the comments. This unit has no wall thermostat, just the controls on the unit. And one replier was correct, if I was handy I could take the cover off the a/c unit and find the serial number. Unfortunately, I am not handy. A lot of times when I take the cover off of something where it is not clear how to do it, then covers do not go back on correctly. It should be covered by warranty, but I can't register the warranty without the serial number. I guess that I will have to foot the bill to take it to a local RV place to check things out, then have them wait to fix the unit until I get the warranty in place.