I have just try it out but I think I did the contacts wrong because the Run has failed again. I saw the Thermal Analysis of a PCB which you show me but that isn’t the same because it only had 1 contact so it’s easy but instead the wall has many different contact surfaces and I don’t understand which are the master and slave.
Also, I have no clear ideas about how to define the Boundary conditions in the analysis: Temperature and Heat flux. So I’m a bit confused.
Thank you @rszoeke