Wow sounds like air in the line. In my old rv didn't have auto valve switch. When tank ran out of propane it would draw air in the line. I would change tanks and when I switched on heater fan would cycle than shut off. I could then loosened line where it connected furnace allow air to escape until propane smell. Try furnace again even then it might take a few cycles for furnace to ignite. Of course take precautions when dealing with propane
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Bill gran
2014 v3005 voltage
Dodge Ram 2500 bagged stock
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