How to fit new diaphragm to vaillant sine 18t3wfh boiler.

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I am expecting a fitter to come on Tuesdsy to fit a new diaphragm as the heating works but the hot water is erratic.The fitter is asking for a manual but I dont have one.Can you send some instructions please.
 
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Years since I worked on one but are you sure it's the diaphragm? The heating would be problematic to if it was the diaphragm.

If memory serves that is.
 
The boiler fires up for the central heating and fires up occasionaly for the water.Outside a neighbours flat is the carcass of the same boiler which BG has not picked up after an install.3 engineers present.My fitter can have a look at the old one if it is still there on TTuesday;
 
The diaphram I recall is in a housing above the gas valve and a pin comes out to let the gas through. That happens hot water or heating as the pin is activated by the pump which operates for both.

Does the pump run when hot water is called for?
 
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Faulty diaphragm in water section which is at bottom centre of your boiler can cause your fault .




Vulcan is gettin mixed up
 
Faulty diaphragm in water section which is at bottom centre of your boiler can cause your fault .




Vulcan is gettin mixed up

Getting, Getting? I was born mixed up. I still don't know which blouse goes with which skirt.

yes, I know what you mean now. Off to the dropbox to have a look and remind myself.
Oh well. Thanks for the correction. Still, now I have to look at the water section to see the relevance of the wax stat. That was the thing that gave problems in this area.
 

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