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Why doesn't my Worcester Junior 24i fire up immediately?

Boiler is 5 years old and serviced yearly. Lately it does not fire on demand CH or HW. Fan comes on as does pump and I can hear the ticking from the ignition. On demand there is a loudish twang/buzz noise. Ignition stops and the process (Fan, pump, twang, ignition) starts again. Usually 3-5 attempts and then burners come on.
Daniel, June 2009
HI Daniel I sounds like your gas vaule is lazy and needs to be re placed

capitalboilers.co.uk, June 2009
link Click here to see other fixes for Worcester 24i.