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Excessive soot in an oil furnace can be caused by a few things. One might be that your burner is dirty, the burner could be old and lastly, your furnace may be in need of an air adjustment. Answer Excessive soot is caused from the oil burning in a "rich" condition much like black smoke coming from a car. The fuel nozzle could be partially plugged and cause the flame to impinge on the chamber, the air inlet to the burner could be partly obstructed with dust/pet hair/dryer lint.....these would probably be the most common causes. And finally, it could possibly have been adjusted by the previous technician to be a little rich and soot would build up fairly quickly as a result. The cure for your problem is to schedule a tune up and any of the things I have mentioned would be addressed by the technician at that time.

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17y ago

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