Your electric motor has stopped responding and you need to replace it. Follow the step-by-step instructions in this tutorial. The motor is delivered with its mechanical reduction system. Don't try to separate these two elements, as you risk losing internal components that will be very difficult to reassemble without damaging the whole unit. For simplicity's sake, it will be necessary to remove all internal components from the cylinder.
4″ BTR wrench or head, Phillips screwdriver
Replace the new motor on the bracket. Make sure that the motor wire (arrow red) is on the bottom right-hand side during final reassembly.
Check its position in relation to the locations of the rubber blades (arrow green) which will be located on the sides of the motor.