|
Your furnace works exclusively on 12 volts. It is sensitive to low voltage. If the voltage drops to below 11 volts (actually it's 10.?, buts lets call it 11 volts), it will quit working. The symptoms you describe are OPPOSITE of what one would expect to happen. When your camper is plugged in, the shore power (120 volts) would activate the voltage converter, which would boost the 12 volt system to somewhere above 13 volts. Your furnace should like this more than if it were operated overnight on strictly battery storage without shore power. The furnace can easily draw a weak battery's output below the 11 volt cut off point on a cold night long before morning arrives. I would suggest starting with some type of voltage display that you could monitor data during the operation of the blower. Your voltage converter may be putting out excessive voltage that the furnace control circuit board doesn't like. If this were to be the case, your batteries won't like this over voltage either. Over voltage output will boil off the water in your batteries, cause a rotten egg smell, and can damage the battery cells. Another palpable symptom of a battery being over charged is the casing of the battery will be very warm to the touch. This one is a head scratcher. As a courtesy to anyone who reaches out to help you, it's always polite to report back the solution when found. Best of luck to you!!
|