rv comfort thermostat

[TonyMin]

The wiring colors don't match and I am having a hard time figuring this out. I was searching all night.
For instance, the rv has to yellow wire. I have two reds, a fatter one and a skinny one. This is supposed to be wire to wire but it would have been nice if the wires matched in color.
RV has fatter red and light blue, then in thinner wires, blue red green and white.
Thermostat has yellow red white blue and gray

[TonyMin]

I had no idea it wouldn't work with my Dometic. I called tech support and that is what they said.

[Bobbo]

A lesson I learned, just today.

I can't help you with the color of the wires, but after getting it wired properly you want to test it.

To test the air conditioner, TURN THE 110V POWER BACK ON!

I replaced my thermostat today. (Exact same thermostat so wire colors matched.) I tested the furnace first, worked fine. Then I turned it to A/C. WOULD NOT WORK. FAN WOULD NOT EVEN COME ON! I pulled it back off the wall and went for some test equipment. As I was walking back, I remembered that I had turned off the 110v power before starting!

Duh!

[Chris_Bryant]

What are you trying to do? Usually, you have to go back to the unit itself to figure the correct colors, but the RV Comfort (Coleman) thermostats normally have the furnace hooked directly to them, so you should have 2 separate sets of wires- 2 to the furnace, ~5 to the air conditioner.