No Spark VCW 242 EH Vaillant Combi?

Hi need some help please. I have a Vaillant Combi VCW 242 EH & it will not fire up. It has no spark, pump & fan runs fine.
Have already tried a flame & spark supervision board & an electronics board. It appears to have no voltage to gas valve and ignition module that the ignition leads connect to. When sucking/blowing can hear air switch clicking.
Any ideas or help greatly appreciated.
If any more info required send me message.
Thanks Paul