Recent content by Laura147

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    Vaillant Ecotec Plus/BDR91 relay/Honeywell CM921 -> Nest

    Hi all :) I'm trying to figure out whether I need to call a professional to install a Nest Thermostat E: I currently have a Vaillant Ecotec Plus, with a BDR91 relay that talks to a (wireless) Honeywell CM921. The Honeywell is starting to fail (the down button is randomly triggering which...
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