I had the same problem. The stepper motor driver must be set. On the board is a small screw to see where you change the voltage. Many say 0,8V. With me the engine moves only a little. I have now set 1.088V and he works very well. I found almost nothing on the net and just tried how to do that. Somewhere here in the forum I have posted a picture of how the voltmeter is clamped.