@Queevix said in Temperature offset?:
Also, what is an ADC channel?
Analog Digital Conversion. It's the part that takes the analog signal from the temp sensor and converts it to a digital representation.
When and where did you get the board?
Can you try updating your firmware by uploading this zip file to the system tab in DWC? Just in case.
https://github.com/Duet3D/RepRapFirmware/releases/download/3.4.5/Duet2and3Firmware-3.4.5.zip