Since the problem is both the furnace and the A/C I would first check the phone like cable in the A/C and make sure it's tight in the connection to the circuit board in the A/C unit (hard to figure how it dropped out, but worth a check) Next I would replace the board since the thermostat sends the request to that board and then the board communicates with the furnace or AC.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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