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Potterto Lynx, only get hot water when Heating is on?

With the heating off i get no hot water. I run the tap but the boiler does not start. If i turn the heating on, i get hot water at the taps. but is getting very warm now to have the heating running. Any ideas
Mark, March 2008
sounds like the diverter valve

lloyd, March 2008
sounds like a faulty flow switch

paul, March 2008