Hey, I have a 2002 3670RL too! Not many of us do anymore, though, so you might not get help specific to the year, make, and model of the furnace.
I can't help you because I turned on the furnace once when I first bought my rig used in 2015--but it smelled funny, and I didn't want to deal with propane anyway, so I haven't turned it on again. (I've always been in a place where electric space heaters are sufficient for winter heating--lots of below-freezing overnight temps, but 99% of the time, above-freezing daytime temps.)
This forum's been around for a long time, though, so I would say that if you can't figure out what's wrong based on the general propane furnace suggestions people give you, try looking through old posts to see if someone with a 2002 posted about furnace problems in the past.
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