Furnace is LP fired for the heat. 12V is needed for the fan and control circuitry. If your not plugged into shore power, and the battery(s) get weak enough, the fan won't turn fast enough to complete the circuit for LP ignition.
A/C units can have either a heat strip (if option is installed) or also function as a heat pump. Both of those operations require the proper unit, thermostat and 110V.
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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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