regardless of what I do the door will move 2 feet and reverse automatically by 2 feet. what did i do? 1. covered one of the sensors near the bottom of the door to detect sensor operability which work as designed. causing the light to flash after stopping the door immediately and revresed 1 inch. 2. Removed the sensor gear and received the same result where the door would move 2 feet and then reverse 2 feet.