One sends a beam of infra red light to the other.
Garage door not closing flush.
Garage floor may have cracked or shifted 2.
Garage door seal may be damaged 4.
First you need to see what has caused this to happen.
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.
Garage door opener malfunction or door has shifted.
The cement where the garage door shuts is not level it tilts from the middle down to the sides to where there is close to an inch showing when closed more so on the left than the right.
The top however is not flush against the frame.
If you need to change their tensions move them to a new hole.
The reasons your garage door has a gap in it could be.
Ground not flush when shutting garage door i appreciate any advice here s my problem.
With these removed it will close another 1 2 or so but there is still a gap.
Springs are one of the main causes of malfunctioning garage doors.
There is about a 1 1 2 gap.
First check the sensor lights.
If your garage door is of the swing type check that everything is tight and secure on the spring plates.
I removed the sleds and the garage door opener arm so that i could see if those were inhibiting its closing all the way.
The door closes flush to the bottom of the floor.
Garage door sensors may not be aligned correctly 3.