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Hi my name is Robert....
The 4 button duo therm is obsolete, they do not make the 4 button anymore. It has to be replaced with a 5 button controller AND the circuit boards need to be changed out in the AC units for that thermostat to work. Most any RV parts store can get you the kit for this. I also know some customers have sent them in for repair click HERE for that, these guys also shoe the kit that is needed.... Hope this helps. IF you are satisfied with my efforts please feel free to select a rating... Robert