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  1. P

    Nest 3rd Gen Problem - Hot Water comes on with Heating

    Thanks Stem for having a look at my issue and your advice - much appreciated.
  2. P

    Nest 3rd Gen Problem - Hot Water comes on with Heating

    That's correct, no other changes. Maybe everything is working as normal then and I'm just being paranoid due having touched any wiring :)
  3. P

    Nest 3rd Gen Problem - Hot Water comes on with Heating

    Pics of the Megaflow wiring and Honeywell receiver attached
  4. P

    Nest 3rd Gen Problem - Hot Water comes on with Heating

    Hi Stem, Thanks for the reply - glad to hear the Nest wiring looks correct! I haven't removed the Honeywell room thermostat or receiver. Its still in place with the thermostat turned to max. I didn't want to remove it until I was sure the Nest is wired up and working correctly. Before fitting...
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    Nest 3rd Gen Problem - Hot Water comes on with Heating

    Pics attached
  6. P

    Nest 3rd Gen Problem - Hot Water comes on with Heating

    Morning all, I was hoping somebody could help me with a Nest 3rd gen installation please? My problem is that the Hot Water comes on with the Heating, even when it's set to off from the app. My set up was: Boiler: Vaillant EcoTec Plus 630 Tank: Megaflow 210l Programmer: Honeywell ST9400c...
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