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sabere 25he died pcb change which one ?

Hi my boiler fitted last november so not even 1 year old . tried fault diagnosis fan runs pump runs no hot water or heat pilot no spark tested power all points to pcb fault . my problem which one there are two parts main board part 10025340 and side one that fits on part 10022174 a guy on e bay is selling main part for £126 plus £7 delivery but unsure if this is what i need any ideas bob ps anyone got a cheaper spare !!
bob shirra, July 2009
The smaller circuit board (10022174) is the ignition sequence control board.

Ian, July 2009