My rear a/c seems to be completely dead, no fan, no cool, no heat pump. System is a pairof Dometic Penguin roof a/c's, a pair of atwood furnaces, and a dometic 5 button controller. Rig is a monaco...
At the dealership, Ive had to unplug the 12v system completely on these zone control themostat for a hour or so and reconnect. It resets it. I would try it