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thanks for the quick response. The controller we are using is called Horstmann - centaurplus c17 I don't believe that it is faulty as when the heating does switch on, as the red indicator for central heating is off. so When the heating does turn on...it totally avoids the controller and...

Hello All, I seem to have a strange problem with my Vaillant VCW GB 242 EH COMBIcompact. My controller is set to off. But when we use the hot taps after some time our central heating will turn on (the radiators turn on). Even though the controller states that the central heating is on...