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I seem to have both HW and CH, certainly the radiators were warm and the tank water was hot. Not having enough hot water hasn't been a problem yet. It doesn't look good: the wiring pdf I saw said grey and white both 240 means CH only. Grey only 240 means valve hold in last position. White...

Hi, I had a 3-way valve V4073A fitted a year or two ago. When there is no power or the hot water is on the lever is in the B position for diverting water into my hot water cylinder. However if I turn the cylinder thermostat down, and the central heating control up the lever stays in the...