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heavy black smoke?

riello oil burner
rodney mckay, June 2009
your boiler need a serice ASAP you should not use it David

capitalboilers.co.uk, June 2009
Blocked boiler or flue pipe more than likely, but you need to get the oil pump pressure checked (140 psi approx) before a full diagnosis can be made.

John, June 2009
link Click here to see other fixes for Riello.