Dometic 4 button to 10 button thermostat and control boards

[Dave Fernandez]

You might want to check the data line couplers. There are a total of three two on the front A/C and one on the rear. If they were to become corroded they will cause the A/C not to work properly. I found out the hard way when someone told me about. Easy to replace and corrected my problem. Even when I took it to a RV service center they wanted replace the data cable. Turned out to be a $15.00 part, you should use the Dometic part as regular telephone couplers do not work.

Dometic USA 3313107.037 - Kit A/C Svc In Line Coupler

[andy29847]

Originally Posted by Jim A

Now that you have everything working correctly, is now a good time to tell you about the EasyTouch RV thermostat? They didn't have a model to replace a 4 button thermostat, but they do have one to replace the 10 button model. I had the 5 button Dometic and replaced it a couple of years ago. It was an easy swap, unlike what you had to do with the control boards.

I received and installed my micro-air thermostat today. It was easy! What a neat piece of gear.

[followingsea]

[QUOTE=Jason911;6372261]Hello all!

,,,,,

Anyone upgrade from a 4 to a 10 button?

....

I found refurbished units and did it on both of my old MH.

However, the rear A/C stopped working a few years later. There are 19 possible failure points even if the controller is working right.

I got to thinking about the first A/C I installed in a TT in 1980. It was horrible. You had to stand up and reach up, turn the on/off switch to the on position.

I was a mechanical engineer but since the navy trained me to use on/off switches on nuclear powered ships, I soon figured it out.

BIL was in the USAF. He once got a work order from a pilot that a piece of gear did not work in the official (abbreviated off) position.

Anyhow for about $100, my rear A/C works great. I do have to get off my butt but I have to go to the can depending on beer consumption.