Bad top oilite bearing just under drive sprocket on opener power head.
Garage door keeps bouncing back up.
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.
Check how door operates in manual mode and run it up and down by hand feeling for heavy weight grabbing or binding points.
Your garage door sensor works by having two photo sensitive devices on either side of the garage door.
A careless or rushed parking job can cause the car s bumper to block the sensor.
As is the case with so many issues at the home there s no one reason why your garage door closes then opens.
This is almost always the result of a dirty or obstructed safety feature.
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.
Your travel down setting needs to be adjusted.
Try the door and if it still re opens turn the same dial another complete revolution.
It goes partway down reverses direction and goes back up again.
Sometimes it can be torsion springs have relaxed some of its tension and door has become too heavy.
Missing wheels on door rollers.
You push the button to close the garage door.
Turn it one complete turn clockwise.
This setting basically controls how much force is allowed when closing the garage door.
Here s a rundown of some of the possible reasons this can be happening.
Most likely there is an obstruction or motor sensitivity is incorrect.
You want the one on the left.
Bad pillow block bearing on torsion tube.
If you find that your garage door is reversing before even hitting the floor then it could be possible that there is a problem with the close force setting.