Please help. I have an oil furnace. Upon starting it up lately there is a HUGE amount of black smoke coming out of the chimney outisde. I have never noticed this before. Last night when the furnace came on I though a helicopter was landing on the roof the house shook so much. I just now turned the heat back on and the house shakes and rumbles and the black smoke is still emitting from the chimney outside.
Is there anything I can check for?
Thanks so much
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