I am assuming your Palazzo has the Dometic Single Zone TStat (similar to the two that my 2014 had, because the model I had, had two furnaces). I am also assuming you checked the 12v fuse for appliances, but they should be good as you have a display on the Tstat. There are only 3 wires from that Tstat, DC pos, DC neg, and comms. They run to the control box accessible after removing the air return cover of the Air Conditioner. The furnace DC wires run up there also. The furnace DC neg could be spliced into the Tstat DC neg before the Tstat wires run into the control box. There could also be a connector before the control box. Try wiggling the wires going into the connector(if present) or into the control box. Could be corrosion as a result of moisture. Good luck.
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2018 Four Winds 31Y
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