One sends a beam of infra red light to the other.
Garage door will open but not close.
This is one of the sensors.
If the beam is broken or the sensors are misaligned the sensor light s will go off and subsequently tell the operator not close the door.
The photo eye is blocked dirty or misaligned.
The garage door may attempt to go down but will come right back up and the overhead light on the garage door opener will blink.
Don t just assume that if the path is clear that the sensors are ok.
The operator receives no power.
This problem bugged me for several months.
This also disables any remotes or wireless keypads.
Hopefully after you read this you won t have the same problem in the future.
If your garage door won t close all the way the problem could be due.
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Turn the power back on and the door should open and close normally.
This feature normally only fails when the door is already open and won t close but some models.
If your garage door opens ok but won t close then it s possible the safety reversing sensors are not correctly aligned.
Clutter or obstructions that block the sensor are the first problems to look for if your door won t close or in extreme cases open at all.
Check the door s electric eye.
Sometimes a garage door won t open or close for one reason only the operator has.
First check the sensor lights.