z axis motor back and forth
I have a rostock mini pro
When I click home button, x any y work correctly. But z move back and forth continuously until I click emergency stop.
If I click Z move the Z move back and forth.
All end stops are in low.
If I understand you correctly one one ot the 2 motor cails of z motor gets power. Check contacts and wiring.
Than you for your answer. It was contact problem.