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    Vaillant Ecotec 6 series - How to trigger HW demand?

    Hi, This is a very simple question (to save on a long explanation). I want to add another zone to my my valiant 630 and did this with an VR40 add on relay module, which works OK via switching on the relay via the VR932 controller - but desn't trigger the heat demand, so I need another...
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