Beau388 may be right, but since you don't hear them making an attempt to move, I think I would try to find the fuse first and check it. The steps normally have in-line fuses that go directly to the house battery from the controller. The step motor functions similar to most car window motors that stop when a higher than normal operating current is sensed. That design enables them to stop if they try to open against a sidewalk of closed when something is limiting full movement. As an example, they don't move far if you are standing on them. The controller senses the high current and stops the power to the motor. Also the next operation is the reverse function. If the fuse is weak, it's possible for the fuse to blow before the controller shuts it off.
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