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If this is a CCC2 Dometic thermostat the thermostat receives 12 volts from the air conditioner electronic control module up on the roof... the wire is a 4 conductor RJ45 connection on back of thermostat and up at control module
I’d try reseating connections at CCC2 and up top on roof... the other two wires in that 4 wire line are for the CANBUS data telling control module what to do..
You stated you checked the two blue wires up top that go to furnace..did you check the joining connections on those two wires at back side of furnace where the connect to wires running up to roof unit
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