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Vaillant VCW GB 242EH combi boiler?

CH flame failure due to low water pressure. re- pressurised but wont ignite. pump , fan & DHW working OK
joe, November 2009
is diverter moving off microswitches on left hand side at bottom ifso possible faulty servo valve or blocked banjo tubes

c, December 2009
Try venting the boiler.

dave stewart, December 2009
link Click here to see other fixes for Vaillant.