Nest 3rd Gen and Vaillant ecotec 624 y-plan system


26 Nov 2019
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United Kingdom
Hi - I know there are multiple post regarding Next setup and connection however I'm unable to find any information on my specific issue. I this has been covered, please point me in the right direction.

I have a y plan system with a Vaillant ecotec boiler set up with a 3rd gen Nest. When turning the heating thermostat up, the valve does move to the H position however my issue is that when the heating thermostat is turned down or off, the boiler does not cut out and continues to heat. Not sure if this a setting on the Nest or a setup issue. Any help would be appreciated! Thanks
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