One sends a beam of infra red light to the other.
Garage door not close but close with continuous press.
Garage door openers come with an adjustable switch that dictates.
Depending on the brand.
If the door is already open it will not close.
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.
Step by step procedures to try if the garage door of your home will not go down without holding the button before calling a repair man was this video helpful.
If anything interrupts this beam of light the garage door will not close and the ceiling light on the opener mechanism will flash as mentioned in the previous step.
Also try unplugging the garage door opener and re plugging the unit back into the outlet.
This is one of the sensors.
A number of issues could be to blame for your garage door not opening.
To try and correct the problem make sure the eyes on the sensors are clean the wire connections are securely fastened at the sensors and motor head and the eyes are directed at each other.
When this happens your garage door will only close by holding down on the wall button until the door fully closes.
The remotes will not work to close the garage door.
This method is the only way to override the safety sensors and close the door.
The majority of garage doors manufactured since the early 1990s are equipped with this safety feature.
If your garage door won t close all the way the problem could be due to a blocked photo eye.
The photo eye components consist of two pieces that align face to face across each side of the garage door roughly four feet above the ground.
If the sensors are hindered by anything including something as simple as leaves or other debris the garage door opener will emit clicking sounds but the door will not open or close.
These garage door safety sensors are located close to the ground and are responsive to any potential obstructions.
They can only open it.