Thank you - that´s explain it. But in my 3.1T - I´m able to set a speed even if no dose2, 2.1 or dos max is connected - and further on - if I use the app or GHL connect - I can set speed in P4 too - even if there is no Doser 2, 2.1 or dos max connected. It is only in GCC and P4 - that it not works to set speeds if dos 2 or dos 2,1 is not connected

Sincerely Lasse