i had the same problem last weekend to the extent it shorted out the circuit board in the controller.
My problem was kids kept going in and out of the trailer leaving the door open...i believe in the dometic documentation they mention that the trailer isnt closed up, you'll generate condensate on the unit...
2017 Ford F350 Super Duty 6.7 King Ranch Crew
2016 Crossroads Sunset Trail Grand Reserve 32BH
I too had the same problem last weekend...
Did as Mark suggested for about 45 minutes, all was well.
You have to remember, most AC units will only cool the room approximately 20 degrees cooler than the outside temperature. It was 103 on Saturday afternoon here in Texas....it was miserable inside and out until the sun went down.
John (USAF Ret) & Cheryl
San Antonio, TX
2014 Hill Country 32FR
2011 Ram 2500 4x4 6.7 CTD