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I think I have resolution to the Baxi Luna HT 330 and Next UK v3 after getting some good information from Baxi and being chided by Nest for not using a Nest Pro installer. Feedback from the very helpful Baxi team: “Unfortunately the OpenTherm world is more complicated that what it seems, below I wil...

I am in the same boat -- Baxi Luna HT 330 Combi and Nest UX v3. Same symptoms. Contacting Nest for help but no resolution so far. Any chance you figured out what the issue is?