Craftsman Garage door opener
I have a 1/3 horsepower garage door opener that is malfuncitoning. Originally, it would not close the door when it was very cold (temp below 15 degrees F). More recently it started failing to close at temps of less than about 30 degrees F. Now, it will not close at all. When you press the control button, the close cycle moves a few inches and the blinking light comes on. I have looked carefully at the safety sensors and on one the green light is clearly lit. The other appears not to be lit and no matter what I do to try to align it, I cannot get it to light. Any suggestions would be helpful. thank you.