It sounds to me like a critter problem. Maybe dirt dobbers. It could be them, or spiders making nests in your burner or vents. If you get close to the heater unit, can you hear a "clicking" sound (the ignitor trying to light the burner)? If so, and it does not light, critters somewhere would be my diagnosis.
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1976 Newell Classic (Sold)
Home Base: Riverside, CA
If anyone needs my contact info private message me and I will send it to you.
-Joseph-
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