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Biasi sg3 Riello 40 burner constantly firing?

I have a Biasi SG3 with a Riello 40 burner. It has recently began firing constantly for extended periods of time. Is there anyone that can help me? I has been cleaned regularly and there also is an odor of burned fuel in the are located by the boiler itself.
Tim D, April 2012
So replace the pcb? Its a common wear item so to speak?

Tim, April 2012
pcb fault, very common and will most likely happen in time even with a new one

bill, April 2012
link Click here to see other fixes for Riello.