Here s a rundown of some of the possible reasons this can be happening.
Garage door almost closes then goes back up.
Photo eyes or safety sensors are mounted to the track on either side of the garage door about 6 inches up from the ground.
A careless or rushed parking job can cause the car s bumper to block the sensor.
Turn the down limit switch screw clockwise one turn with a flat blade screwdriver if the garage door closes and then begins to open back up.
My chamberlain garage door opener system 1 2 hp seems to be malfunctioning just recently when the door closes it reaches the floor and then goes all the way back up again after several attempt read more.
It goes partway down reverses direction and goes back up again.
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.
Use the control on the wall and hold the button to close the door do not let go until it closes all the way if this closes then its a sensor problem you have to do this with the button on the wall not the remote.
The door stops before it is completely closed or open most garage door openers have an open and close limit control.
Sometimes the sensors will be in alignment and just as the door gets close to being shut it will vibrate enough to push one sensor off.
The photo eyes send an infrared beam across the bottom of your garage door opening if that beam is broken the door will reverse.
They are usually on the motor housing and you access them by opening a panel or removing the housing cover.
By wade shaddy updated december 19 2018 you push the button to close the garage door.
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.
Your travel down setting needs to be adjusted.