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Hi, dometic uses power from the electronic package up in the airconditioner to supply voltage to the thermostat. There is a fuse on the control board, this is the first thing to check. You need to take down the ceiling assy from the air conditioner, and locate the control, It is a metal box, where all of the wires terminate, Once located, open the box, and take a look at the flat ATM fuse on the control, take a look and let me know what you find. Shut off power to the ac prior to taking it apart,,,,,,,,,The circuit breaker that feeds the unit is sufficient