If the above doesn't help then there are a couple of other things to consider. First only one of your thermostates will control the furnace, the other will show furnace but it's just there for show and doesn't do anything. Second, the thermostat sends a request for heat to your main AC unit which then sends the signal to the furnace it'self. So the probem could also be in that AC unit's board or the cable that plugs into it.
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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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