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Hi AfterburN003, Thanks for the reply. Excuse my ignorance but when you say a diaphragm in the diverter valve, is that the flow switch or the water section valve? Cheers Mike

Hi Bunny, Thanks for the advice. Tried your suggestion but left hand large pipe remains cold whilst the domestic hot water pipe (second left, narrower) warms up but not very hot. Mike

Hi, I have an old Vaillant VCW-sine 18 T3 W. Yes I know it's ancient but I would like to squeeze a few more years out of it if possible. The central heating works fine but it has developed a fault concerning the domestic hot water - when a tap is turned on, the tap water does not get as hot as...