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Different boiler to me, but looks wired correctly (makes sense if it was previously on EMS). I can't see anything wrong with what you've done and I'd expect that to work based on my experience with this adapter unless there's a sneaky short circuit.
I initially set mine up for relay control and then Wiser switched to Opentherm mode automatically when I wired that adapter up. It was easy to tell that it was working as it would use low temperature water or just run the pump when there was only a small temperature difference to the set point. The newly updated app doesn't actually show me the operating mode - I assume they broke something. It might possibly be worth running through setup again - hopefully there will be a screen where it shows Opentherm being selected?
Thanks for the reply and pleased to hear it all looks okay. I also couldn't find the operating mode which was available in the app previously. I will try setup again and see if that makes a difference.