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Thanks Guys, Yes it is the water section underneath the servo valve, I fit a new diaphragm to the underneath, when I first started it up the boiler lit straight away without any taps on, so I removed the spindle that is pushed up against the cam and adjusted it, it now puts on the hot water...

I have a Vaillant VCW GB 242, I had a problem with it leaking from the servo control valve. I removed the valve and replaced the diaphragm. I then re-assembled the valve and re-installed. Having done this the boiler would not fire up. I checked through the manual and it gives information on...