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how can I fix my worcester 28cdi ,heating but no hot water?

complete new system fitted 3 years ago inc 28cdi combi . water is at 0.5bar with heating onand will give hot water with heating but no hot water with heating off, sometimes it will fire up but, as soon as you feel warm water it shuts down. the heating is working perfectly
Chris Henderson, December 2006
the dhw diaphragm will have probably worn or split.

EXPERT, December 2006
the pressure needs to be about 1bar / 1.5bar 0.5 if ot gets to low it will shut down altogether. try uping the pressure see how you go

hi-spec plumbing, December 2006
link Click here to see other fixes for Worcester.