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Thanks for your reply so is the diverter valve making the hot water leak into the central heating side of the boiler?

Hi can anyone help i have a vaillant 835e ecomax boiler & i seem to be having problems with it? basically when i use or call for the hot water by using the tap shower bath etc the boiler slowly seems to loose pressure? the central heating side of the boiler is fine & if i do not use the hot...