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What is causing my Riello Mectron 3M Type 215 to emit fine black ash?

Why is my Riello burner emitting a very fine black ash?
Larry, March 2009
incomplete combustion due ot a stuffed nozzle due to running out of oil, oil pressure wrong or air inlet stuffed

gordon

Gordon at fix my oil boiler. com, March 2009
link Click here to see other fixes for Riello.