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On closer inspection I have a VR61/4 not a vr65. Any ideas on the wiring?

That's for your help. I could look into this method. I would need to find a way to disconnect/decommission the existing controller. I assume you have your nest display mounted on a stand?

Thanks Fezster, pictures would be great if you don't mind. I take it you have a nest wired to each zone valve? My valves are 230v so don't think the heat link would provide enough power.

Thanks, is your nest wired into the boiler or the vr65? Do you happen to have any pics at all?

Thanks, would you be able to explain a bit more as to why this would be a backwards step? What should my Vaillant system be offering that Nest can't?

It's definitely bad design, when it was first installed, they had wired the valves up to the opposite thermostat, so down stairs stat was controlling upstairs valve etc. Also changing the upstairs thermostat doesn't seem to work properly, and if I change the downstairs stat, the upstairs one...

Thanks both, unfortunately when the system was installed, it was badly done and the 2 zone system doesn't work very well. In the winter we often have 1 zone too hot and 1 zone freezing, it doesn't feel we have granular control to set consistent temperatures. I appreciate it may be a good...

Sorry, had difficulty attaching. Now in reply

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Hi all First of all apologies for yet another Vaillant/Nest post, I did a search but can't find the correct answer. I have a Vaillant Ecotec plus 612 (heating and hot water tank) boiler which is on a 2 zone (upstairs/downstairs) configuration. There is a main thermostat/controller downstairs...