The bedroom a/c in our new 5er will not turn on. It is: Dometic 640315 Duo Therm 13,500 BTU Penguin Low Profile Air Conditioner Upper Unit with the Dometic 3310700.000 ADB Mechanical Thermostat Shel...
Although the unit has no wall thermostat it still needs 12 volt power for the controls. The 12 volt fuse box should have a fuse specifically for that unit. I'd check that fuse,it may be your problem. You might be able to get a neighbor to check it if you don't feel comfortable.