[Harrisden54]

I had a simialr issue with my 384BR. It would light and go out. I ended up pulling the burner suspecting a bug or cob web. The burner was full of water and corroded. Dometic is familiar with water getting into the burner area on the vertically mounted furnaces and replaced the corroded parts. Water was entering through the exhaust vent. I installed a dryer vent cover over the exhaust but removed it when the techs at the Goshen Rally caulked around the exhaust flange and it seems to have stopped the water entering.