K8400 printing ABS 2nd nozzle

I installed a second nozzle on my vertexK8400. First nozzle (right one) is PLA 210°c the new one (left) is ABS 245°c. I want to print on the left nozzle with ABS but everey time I start to print the temperature jumps to 210°c. I tried every setting but it always jumps back to 210°c
What a I doing wrong here? which settings am I missing? Thank you for you help.