Rv domatic a/c and heater

Either your thermostat is shorted or the primary wiring to the contactor is shorted or even a stuck contactor.

Good luck,

Marty

bad thermotat or relay module.

You need to visit a local dealer...any RV dealer. They should provide a general walk through as a courtesy. Pay them for a maintenance inspection and they can provide a detailed explanation of their work. After that you might be able to troubleshoot/repair simple problems yourself.

Yes, new roof unit will fit right on there. 120Volt wiring already there? How about 12 volt wiring, is it there also?

I would suggest going to an RV place of business to get one. The stat should or will be like a home stat, if I knew the wire colors I could walk you through wiring it up.Normally, only 4 to 5 wires are used. Red would be hot, white heat, green, for the fan, yellow for cool. You are going to need a voltage meter and some help to check for power at these wires. Being a RV, it might be 12 volts. Could be wired for 24 volts ac when you plug the master cord in. I would need more information from you to solve this.
Shastalaker7

just disable the original wire came from the thermo an full it out you will have a two wire now the external thermo has 4 terminal it mean it has an supply depend on the model..
put the two set of wire that came from the thermo and put it to the external thermo and the other two wire is your suplly

First, take the old thermostat off the wall.

there should be different colored wires coming out of the wall still connected to the old thermo.

on the new thermo, there might be a wire color chart in the instructions or on the inside of the new thermo.

You should be able to line up the colors and install them that way. let me know if you have any other problems

Do you hear any clicking at all ( up near AC or down near furnace, when you move the thermostat ? Have you checked you breakers & fuses in the trailer?

I replaced one unite with another and the wires are differance colors the old unites wires are red,purple,yellow,bleck and white the new one have orange,brown,cream,darkpurple,and white

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#.