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Turns out that a freind of a freind is a heating installer so we called him out ,he said that the hot water was going down the big pipe on the left instead of out the tap ,he told me to aquire a diaphram kit for the Diverter Valve and call him back to install it . Diverter Valve with...

Heres the manual with my heating system . the reason i thought it was the 240 H is that it says 240 on the black plastic thing at the left of picture ,though all three models probably use the same parts.

So you advise that i change the whole brass contraption in picture 8 , Whats its tecnical parts name . Is it listed at this site http://www.boilersparesdirect.co.uk/parts-online/shopdisplayproducts.asp?id=3841&cat=Vaillant+VCW+GB+240H

Are you saying that the burner flame is lower than it should be .

My central heating is working ok but the hot taps have gradually over about the last year become colder ,last week the central heating would not fire up due to low pressure so i represurised the system but since then the taps are refusing to run hot,they will sometimes start hot for about five...