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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

Worcester Worcester 350 Heating, Home Heating Systems Worcester Combi Boiler Water

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

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Worcester 350 Boiler Tripping RCCB - Help!