Craftsman Garagr Door Opener

When you push button to lower door, it stops going down and the opener lights blink. Also husband say's the green sensor lights are not on when this happens.

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Are the sensor lights on at all other times?

The most likely cause is the sensors are out of alignment.

Go to the Questions page on this site (It is one of the buttons on the left), look for a link within the first few paragarphs to
"My Garage Door Opens but it Won't Close"