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UPDATE. ....We found that the plenum on our furnace was wide open at the bottom. Looked like it had a panel that didn't get installed. After making a panel and fastening up the plenum better with some drill screws (like it should have been from the factory) and taping all the seams with foil...

I also have a 3650 BH that and I'm having the exact same problem. During our walk through at the dealer the blower wheel melted so the dealer replaced the heater and delivered the RV to me since I was an out-of-state buyer. When I receive it I turned on the heater and within 10 minutes it...