Garage door won't shut
I have a Craftsman 1/2 HP Garage door opener. The problem is that the garage door will not shut using the transmitter or wall button. The trolley goes about 2 feet down the rail and then it returns to the starting position (where the stop bolt is near the motor). I have adjusted the limit switches and the force switches and I still have the problem. Of course, I have used the safety release so the door would shut, but it's a pain to keep opening and closing the garage door manually. Also I have replaced the worm gear and the other gear. Thanks in advance for your assistance.