Preheater Menue

Hello, I’ve been looking for a long time, but unfortunately I didn’t find anything that could fit. So, in the menu I go to stand-up heating and program a day and time, the button at the top left heating I can’t select, which is normal visible, but I can’t set a “hook”. When I’ve driven and the engine is warm, I can select residual heat and that works too. The ventilation in the summer also works. If I stay in the car, I hear something happening at the programmed time. I think the actuators are running, but the ventilation doesn’t open. That takes 3 seconds and then nothing happens. Outside temp. 8 degrees battery. Engine from 12 volts, engine at about 14 volts. Someone an idea Someone an idea? Greeting