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Well,... you got a problem. The thing does not seem to have an online service manual. It does seem to be digital with more then one sensor in the coach. I suspect the little 4 wire plug your looking at is an rs232 interface.
When you get to the "I feel" mode the remote control becomes the room thermostat. Hold it in your hot little hand, put it on a table in the sunshine or place it near the stove any you've just screwd up the heating system. You need a neutral place out of direct sunshine but open to the coach to store that thing. In the "I feel" mode I suspect it would also have to be looking at the ceiling mounted unit. Thrust it into a drawer and you've lost all control and communication.
If anyone can come up with better part numbers I'll try again to find a manual but it's new and not up on the web yet... or a deep dark Dometic/Duotherm secret.
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