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Apparently there are numerous versions of the EMS bus. Maybe my boiler is incompatable with the opentherm adaptor's EMS version ‍♂️ Did find this page though all about a little bit of kit you can buy to fiddle with the EMS bus...

Thanks @harrythefurrysquid. I'm a little wary of trying a factory reset. I'm imagining explaining to the wife and kids why when it was working I've messed it up. Is there anything I can do to remove that risk from a factory reset? Is thre a good online source on the Greenstar menus? The manual...

I used a have for heating and how water on my boiler. HW control was not wired up. Just a loop wir from live to hw demand. CH was wired from hive to boiler CH demand. It worked fine on my Green Star 32 CDi compact.

My Hive thermostat took a tumble and the display broke so was in the market for a new thermostat. Screwfix had a black Friday deal on a Nest so here we are. Wired it in binary on/off mode but read about the opentherm connectivity so as others in this forum have discussed I picked up...