PS: A little tip on the edge for mounting with adapter: At first I had the thermostat is not fitted correctly, so I always got the error F2. I had the adapter simply not pushed right on the valve. It is important that it shall be postponed until it stops. Usually it is only possible if the plastic adapter is something bent.
I enjoyed following this helped: hinweisblatt_danfoss_adapter_0111.pdf (just after "googling")