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Hi my name is Robert....
IF you are talking about the 4 button duo therm T-stat then a 5 button thermostat is needed but you also need to replace the boards inside the AC units, it comes as a kit and is all plug and play. IF you call a RV parts store in your area they should be able to get you the kit, you will need the make and model off the AC unit. There a few places that claim they can fix them click HERE for one of them.....
Hope this helps some, IF you have more questions or concerns please feel free to contact me, IF you are satisfied with my efforts please feel free to select a rating, it is the only way I get credit for helping.... Robert
Hi was just checking in to see if my answer helped?
IF you have more questions or concerns please feel free to contact me.... Robert