Question about Dometic Rooftop RV Air Conditioner

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Rv air conditioning

I have a fifth wheel prowler 93 model it has a Dometic unit in it. this unit was working fine last summer all the way .Now that it is summer agin and hot I try the air will not work at all. I have thought to replace the thermostat. I orderd a (Duo Therm by dometic). Now here is where it starts getting tricky. The thermostat I removed has wires coming out the back that are different colors the the ones coming out of the wall . They just **** connected them together and pushed them in the hole in the wall and screwed the thermostat over top of it. Now this duo therm thermostat i just bought has no wires sticking out the back of it at all, just screw ports for wires . The one thing that bothers me most is what wire to use. Is this factory job or a nut heads job . I did bye the fifth wheel used. And my second question would be if this thermostat is properly installed and still no solution then what! Mind you (I have checked to see that there is indeed power going to the unit, it has power both to the thermostat and the unit on top ).

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  • Dwaine Morris Jul 13, 2008

    well there is 6 wires white orange red green grey and a light blue looking wire . now this is the wires that r coming out of the old termostat.

  • Anonymous Aug 18, 2008


  • James Helmer
    James Helmer May 11, 2010

    Thermostat wires are normally color coded. How many wires do you have and what color are they?



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You may have to remove your filter & look for a model # of your unit, so we can pinpoint your wiring to the thermostat. Usually the terminals on the thermostats are labeled -RC-RH- etc, and you simply move old to new of the same. A lot of times some manufacturers will use phone cable form AC unit to thermostat, and mix up the colors, that's the reason for going to the AC and see what color is used from there. It could be red from control box, connected to green wire to thermostat for example. Thats where you note it and wire accordingly.(terminal calling for red wire, would now be green) If your stumped, get back to us with that model#.

Posted on Aug 16, 2008


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