Oil combustion has been refined for many years now with no smoke at all. It's from the dust in your air and will probably be there again this year. And it’s all over the outside of my building. You could also be starving oxygen to the burner. It is NOT puffing back into the house at all, all of the soot is going outdoors. There is a problem, however, if the soot quickly reappears after a professional cleans it. Question: oil furnace/hot water system started blowing black smoke and smelled of oil (June 26, 2014) Anonymous said: Sorry if this is too specific, but we just moved to an old farmhouse and today the vent (outside) that is connected to the oil furnace/hot water system started blowing black smoke and smelled of oil I called the fire department. A little oil burner soot (no more than 1/8 inch) after the appliance receives maintenance services is normal. It looks like soot but it is not. We use cookies to give you the best possible experience on our website. My oil furnace is running, but doesn't sound as strong or clear. Our photo (left) shows an incompetent and potentially dangerous "fix" to an oil fired heater that was blowing soot all over itself and the furnace room. You could have a rusted out heat exchanger. A rumbling noise from the furnace on startup, especially when the furnace has been off for a long time. Irregular flame: The furnace’s pilot light should be blue, not yellow. DAN: I have black soot coming out of my heater through the vent, through the wall. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. I have oil hot air furnace it blows black smoke thru chimney - Answered by a verified HVAC Technician. The black soot is a symptom of an incomplete burn. To determine where the failure is: It's a myth that modern oil heat is dirty. Then it gets into the supply ducts. The oil nozzle could be partly clogged but this will usually cause a lean burn (oil starved), not a sooty burn. Soot- black substance formed by combustion or separated from fuel during combustion, rising in fine particles, and adhering to the sides of the chimney or pipe conveying the smoke. Intermittent flame failure shut down. The Effects. When dust gets into the furnace and is blown across the heat exchanger, it can carbonize and turn black. TOM: Huh. Smoke in the structure. Soot buildup is not normal for an oil furnace. That’s not good. Clattering sounds: Check the access panels on the furnace itself.They can work loose and rattle, with the annoying sound carried through the house on warm air from the furnace. Black on the curtains around the register is not from soot. Soot buildup comes from incomplete combustion. Although different causes lead to backfires, the effects are largely the same. It’s a wall mount heater. 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