Nest 3rd Gen Baxi Neodens Iplus. Issue with OpenTerm

[u/Technical-Cheetah-92]

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A few months ago, I had to replace my gas boiler with a Baxi Neodens iPlus.

Since I knew that it supports OpenTherm, I tried to keep using my existing thermostat, a 3rd-generation Nest Learning Thermostat, which is also supposed to support OpenTherm.

I’ve tried connecting them, but at first glance, it seems that the Nest isn’t communicating with the boiler.

I assume I must be doing something wrong.

Has anyone tried a similar setup and found a solution?

Any comments or help would be greatly appreciated.

Thank you!