There are 2 photo eyes on each garage door.  They sit just off the ground approximately 6 inches and in most cases are attached to the track.  Each photo eye has a colored LED light that should be lit solid at all times.  When closing the garage door, if something crosses the invisible beam of the photo eyes, the opener should reverse.  If your door reverses and nothing is in the way of the photo eyes, here are a couple things to check: 

1. When you push the remote to close the door, does the light fixture on the opener blink?  If so, you have a narrowed your problem down to a photo eye issue.  If the light fixture on the opener does not blink, you problem is most likely not with the photo eyes. 

2.  Are both LED's on?  On both photo eyes?  When checking both LED's, get down on your knees and cup your hands around the LED and make sure that the light is indeed fully lit and does not have a slight flicker.  If one of the lights is out, adjust the photo eyes and re-align them.  This can be done by loosening the wing nut and eyeing up the alignment of both photo eyes.  If you still have no LED after re-aligning the photo eyes, you may have a bad photo eye or a short in the wire.  Contact our service department for further troubleshooting or to schedule a service call.

3. If you are having a photo eye issue and need to close your door in an emergency, you can override this feature by pressing and holding your wall control button until the door is fully closed.  This cannot be done with the remote or keyless entry.  

Make sure to keep the photo eyes clean at all times. Keep photo eyes free of shovels, tools, brooms, snow, weeds or anything else that may interfere with the photo eyes.