I tried different firmware, and on Mk4DUE 4.3.2 encountered a problem:
The HotEnd0, controlled from pin 13 arduino, will not turn on. On other firmware everything works.
Tehrmistor read 23C, when choosing a dummy thermistor (998), the hotend does not turn on either.
In repetier firmware and marlin 2.0 it work.
There is an assumption that pin 13 in MK4Duo is reserved for something, but under that I can not find