Duo Therm roof A/C

Module board & compatable T Stat are gonna cost $238.

I found a trouble shooting guide on line.
It looks like its the module board that's bad.
Called the dealer for parts

That looks kinda like mine.
I have 12 volt at the fuse, & the red wire.
There is a circuit board in the box.
Looks like one of the "phone" plugs it not looking too good.

Remove the inside trim and you should have access to the control box.

Wires include, 120vac, black pair to freeze sensor, bundle from thermostat, blue/white to control furnace, and some black/white paired wires that carry 12vdc.

The 12v wires should be attached with a crimp connector to the harness. Get your voltmeter on those wires to check voltage.




Paired white/black are 12v supply.
Blue/white is control connection to furnace.
Yellow is 120v power bundle.
Black to the left is the freeze sensor.
Brown is the bundle from the thermostat.





Or maybe your Dometic is completely different.

It's getting power at the AC unit.

I don't know about 12 volt power.........Don't know where to check that???

Is it getting 12 volt power to the control box?

Circuit Breaker ?
There may be 3 of them.
At the pedestal/power receptacle,
on your RV power panel
and on your converter/inverter.