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Thanks Denso, but seems to be a different problem to be mine.

Got a new board from PTS - part number 1178888 - £94.00 +VAT. Put it in and all working for now. Anything changes I will post.

Thanks for the reply. In your experience have you ever come across a board that buzzes in this manner? Its really loud, I actually thought the boiler was fitted with a buzzer! There's no spark at the electrodes and its the board that feeds them that is buzzing, so I have made the leap to the...

Biasi M90F has stopped working. Steady pulse from standby light. When requesting CH or HW it starts buzzing - one second of buzzing, stops buzzing, then one second of buzzing. Over and over and over. Took control panel apart and there are two pcbs. One on the right has a relay in the middle...