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worcester 350 combi boiler keeps tripping RCCB?

As soon as demand for either hot water or central heating is called for the RCCB in my consumer unit trips.Any ideas?
DaveP, October 2009
Thanks Ian diagnosis spot on. Fan changed now ok.
Cheers

Dave, October 2009
short circuit on one of the components. most likely fan / gas valve / pump / pcb. get a qualified engineer to diagnose the faulty component & replace it.

Ian, October 2009
link Click here to see other fixes for Worcester 350.