Extruder motor not turning、Extruder gear not turning
Poor Wiring Connection
3.1 Reconnect the extruder head adapter board ribbon cable.
3.2 With a multimeter available, measure the continuity of the ribbon cable and the voltage of the E-axis driver.
https://www.youtube.com/watch?v=FDjs3Ij1cq0
3.3 Measuring the conductivity of the adapter plate.
After checking the above steps, if the problem still cannot be solved, please contact after-sales service cs@creality.com