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How does one change the diaphram of a worcester boiler 28CDI?

My hot water is not working but the central heating is hence I suspect it to be the diaphram.
Ish, November 2006
its almost definitely the diaphragm but you have to remove the calorifier to get to it
call a pro

BG MIKE, November 2006
or diverter valve stuck.

plumb, November 2006
link Click here to see other fixes for Worcester.