Dou Therm 57915.622 won't work.
I have a 1999 Newmar American Star XL With one roof air (57915.622) and one furnace (I have not found a label on it yet) with a 4 button thermostat, that I just picked up and they didn't work at that ...
Forum Discussion
There should be 2 wires(probably blue) from the furnace to the controller. They need to go to the thermostat. The thermostat is just a switch that connects the 2 wires to turn the furnace on and disconnect the wires to turn the furnace off. You can test the furnace by connecting the 2 wires at the controller and the furnace should work. If the furnace works just extend the wires to the thermostat(common and heat) and you should be good to go.
