to replace a split diaphram on my baxi 105e combi boiler i need to drain primary circuit can anyone explain how this is done

chris bell, May 2008

is it dhw diaphragm, the one that faces you that always leaks from the pin. are you just fitting dia service kit?

if so isolate cold supply to boiler underneath and open hot tap to drain, then crack on undoing the 6 , 7 screws and impulse tube.
keep pressure on as you undo cos its quite a tensioned spring.

iain, May 2008