If you removed the AC units, you removed the control board that controls the furnace.
When you use the thermostat and ask for “heat”, that signal goes to the control board in the primary AC unit, and it in turn sends a signal to the furnace. My explanation may be over simplified but should give you the basic idea.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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