I know exact times when the power is off for these 40minutes. That's why i wanted to program it to set temp for example on 0C during these 40min intervals. There are I think 6x40min intervals during the day.

What internal sesnsor do you mean? I am bit confused, you mean BDR91?

Yeah I linked it via mobile app, so now the evo controller shows 21.5C , my two other thermometers 22.5C and app current 21.5C and target 21.5C ... that's odd.