ideal logic combi c30

Hi all, Hoping to get some advice on my system. Moved into a second hand house last year, previous owners done the following New pipes flow / returns throughout house along with new hot/cold water feeds. New ideal Logic combi 30 max installed upstairs, 2 floor house. Roughly 9kw of Type 22...

So I’m trying to replace my old Drayton LP111si timer and manual Drayton thermostat with Google Nest connected to my Ideal Logic Combi C30… I’ve followed @stem ‘s brilliant instructions so far to get the Heat Link installed, the Google Nest is working powered by a USB cable, and my original...