That sounds like a heater they are talking about, I have seen them flar up from wasp nest in the burn chamber, loose gas line letting just enough out to fill the area but not leaking enough to trip or shut off the flow at the regulator then a spark and poofff.
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Mark Anderson - Nebo NC - western NC - RV Restoration tech - 9 Doggies - Outdoors person
1990 33ft Wilderness Cimarron 33X
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