So you had good and changing encoder values on the controls tab?
Picture of controls tab
You mean it stalled/blocked even when moving downwards? Sounds more like a misfunction on the motor driver/encoder to me if that assumption is right.
I’d say its not possible to destroy a motor/encoder that way. You could try to plug the encoder cable inside the electronics box into f.e. the Y-axis connector and see if you can read encoder values there.