Here s a rundown of some of the possible reasons this can be happening.
Garage door ogoes back up.
If the door goes up seemingly on its own after you close the door be sure to check for any debris the sensor is picking up.
Make sure only the safe t beams that came with this garage door opener are installed.
These garage doors have sensors near the ground to ensure nothing gets stuck underneath the door when it closes.
Garage door starts down then stops and goes back up or safe t beam system malfunction.
Your travel down setting needs to be adjusted.
Try making small adjustments.
In your efforts to get your home safely sealed up again.
The garage door will automatically go in reverse whenever it hits an obstruction such as the driveway or ground.
A careless or rushed parking job can cause the car s bumper to block the sensor.
T his is a pretty uncommon problem but one that can happen after you ve first installed your garage door opener.
This is almost always the result of a dirty or obstructed safety feature.
You push the button to close the garage door.
Most garage door openers have an open and close limit control.
This is related to the up limit switch.
Check if the limits are properly set.
Check if the safe t beams red led light is flashing.
The opener sees that as the door not being able to close completely and since that could be caused by something or someone trapped under the door it reversed the door back to the open position as a safety precaution.
If anything is blocking the path the door will not close.
Possible reasons why your garage door hits the floor then goes back up as is the case with so many issues at the home there s no one reason why your garage door closes then opens.
Your garage door sensor works by having two photo sensitive devices on either side of the garage door.
It s important to get this switch at just the right distance from the motor so that the door is able to close all the way but the motor also knows to stop running.
Adjust the limits as needed.
If these can t see each other when the door is almost shut it will send a signal to the garage door motor to open back up.
Keeping the garage door closed is important to home security so life can become pretty stressful when that door can t seem to stay shut.
In this case the garage door opener detects that it is coming into contact with.
They are usually on the motor housing and you access them by opening a panel or removing the housing cover.