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Am I expecting too much from my furnace?
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Yes, and also expecting to much from the batteries.
Your other items, water pump, jacks, slides will probably continue to run even when your batteries are dropping down below 9 - 10 volts.
However, the combustion blower in your furnace isn't turning fast enough to safely support combustion, so the furnace doesn't light.
Your furnace has a safety device called a "Sail Switch". Basically, its job is to measure the air pressure (air flow) in the combustion chamber to ensure the combustion blower is running.
Anything that prevents adequate air pressure or restricts combustion air flow will prevent the propane from being turned on. A Low battery is the most common as the blower isn't turning fast enough to activate the sail switch. ALSO, blocked combustion air vents can prevent adequate air flow, even on a fully charged battery. Look outside where your furnace exhausts, make sure bugs didn't set up housekeeping in the intake or the exhaust vents.