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

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

Did you wire this up yourself?

The Novice said:

Did you wire this up yourself?

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Yes I did

ianmcd said:

https://www.diynot.com/diy/threads/...is-present-on-programmer.534009/#post-4496361

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Thanks ianmcd - definitely sounds like the same behaviour. I'll get my heating engineer to double check that!