Your garage door is programmed to travel a certain distance before it closes.
Garage door closes then opens a few inches.
A broken torsion spring will also cause the door to slam closed instead of closing gently.
In order to fix this you ll want to make small changes to the close limit setting until the door opener knows to stop once the door has reached the floor.
If the door is working properly it should be easy to lift by hand.
If the door starts to open but won t move more than a few inches the torsion spring may be broken.
It goes partway down reverses direction and goes back up again.
If your garage door is closing fully and then reversing to open again then it may be due to a problem with the close limit switch.
It s the part of the door mechanism that moves the chain that opens and closes the door.
Here s a rundown of some of the possible reasons this can be happening.
Try to operate the garage door manually this helps you determine if the problem is related to the door or the motor.
Turn the down limit switch screw counterclockwise one turn per every 3 inches of the garage door gap the.
Tighten and re align your eyes and you should be fine.
Disconnect the opener from the door itself like so and open it manually a few times.
As is the case with so many issues at the home there s no one reason why your garage door closes then opens.
I d bet a small fortune that your eyes are getting bounced around while it is opening shutting and disrupting the process but you will want to be sure you don t have anything major going on by doing the above.
The garage door can be operated manually by disconnecting the garage door opener from the door using the red pull cord.
You push the button to close the garage door.
Fast easy step by step process on how to properly program your garage door travel system.
If not there is a problem with the door.
Your travel down setting needs to be adjusted.
If you release the door from the opener using the release cord see image below you should be able to lift the door to half open by hand and the door should stay at that point if you release it.
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There could be a bind or drag in the door mechanism or the springs may be damaged or need adjusting.