rgatijnet1 wrote:
I believe that some of the stair motors are the same as those used in the power windows of vehicles. There should be some electrical limit switches that will shut the motor off when the stairs extend fully or retract fully. It appears that your stair motor is not shutting off when the stairs have reached their limit. Perhaps a wire has come loose or a connector is corroded and the signal to shut off the motor is not there.
X2
HR used the same motor and assembly used for power windows in cars. You should be able to find replacement parts at most automotive parts stores. Sorry, I can't recall what brand or model of car.