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How do I change a Diaphragm on a 20/80 flowmatic VOKERA combi boiler?

Central heating working ok.Hot water starts to heat up but then runs tepid.So how do I change the Diaphragm.
Allan Mclachlan, November 2005
Vokera Installation & Servicing Manual, p26.
Section 8.18 Removal of Domestic Hot Water Manifold.

Helper, November 2007
link Click here to see other fixes for Vokera 20/80 Flowmatic.