i had the same problem with the same boiler but had to smack it in a few different places it got to the point were i had to have a 3 round full contact fist fight with it to fill the bath. after a wile all the beating stoped working.
so on further investigating (not by me) narowed it down to a problem with the main printed circuit board, replace or repair its your choice, or the compitant and duely qualified person you chose to do so, please note its not big and its not clever to smack your boiler about or to strip it down. hope this is some what helpfull.
captin-paxo
November 2008
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