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s97

  1. C

    Ecotec plus boiler with VR66 gives code s97

    I have mounted a VR66 wiring centre in dual zone (switch in position 0) with two VRT350 thermostats. The heater is an Vaillant Ecotec Plus with combiboiler from october 2020. And I must say it works very well when one or both thermostats ask for heat. When there is no demand for heat the boiler...
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