@dc42 Thank you! The K"J" parameter did the trick, it works prefectly 
I saw it was also changed in the documentation 
I noticed one more place (in the new docs) where it could be changed, Im sending the picture and link: https://docs.duet3d.com/User_manual/Connecting_hardware/Temperature_connecting_thermocouples
Otherwise we can mark this topic as solved
Thank you again