There is a sensor that is intended for obstruction detection that will stop the extending and retract if it were to hit an obstacle. It sounds like this is malfunctioning as it shouldn't detect stepping pressure when fully extended as an obstacle and even so should retract fully not 50%.
If your step is fully extending and retracting without this pressure, we can eliminate the possibility of a switch issue on the door. We can also eliminate the motor and gearing. That leaves the control... view full answer...
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