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
I am assuming that the wall tstat has NO display? If so, replace the phone type modular 4 wire plugs at the wall tstat and at the AC upper control board first. Corrosion on those modular plugs is the normal cause of NO display. Doug
