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loads new parts fitted, fan runs, air pressure valve works tested for power at c terminal ok. new ignition board, new electrode, power there also but no spark. no current in cable from board to the multifunction valve even though the power is there on the board. ??

myson orion 50si boiler not sparking, its got new ignition board just fitted, new air pressure switch just fitted, and new spark electrode just fitted. power going to everything, the only`thing wrong is the plug from the board to the the multifunctional control valve is not passing a current...