Here s a rundown of some of the possible reasons this can be happening.
Garage door goes back up when it hits the ground.
To get it to stay down once it hits the ground i push the button on the remote again and it stays down.
When i use the remote or wall button to close my garage door as soon as it hits the ground it goes right back up.
Your travel down setting needs to be adjusted.
It goes partway down reverses direction and goes back up again.
In this video i show in detail how to get your garage to stay shut if it continues to bounce back up.
This issue happens less often than a blocked or off track sensor.
If the door hits an object when it is closing it will stop and raise back up.
This is almost always the result of a dirty or obstructed safety feature.
What is probably causing your problem is that the switch that gets tripped when your garage door closes is too far forward allowing it to hit the ground before it trips the switch to stop the garage door.
The garage door will automatically go in reverse whenever it hits an obstruction such as the driveway or ground.
If it looks like your motor is forcing the door into the ground and going back up again then there are a few reasons that his might be happening.
This is so it won t crush a kid or a person if they happed to be under the garage door when it closes.
As is the case with so many issues at the home there s no one reason why your garage door closes then opens.
Garage doors have a pressure sensitive mechanism on them for safety reasons.
My garage door hits the ground then goes back up again.
Possible reasons why your garage door hits the floor then goes back up.
Look for two screws on the motor base.
You push the button to close the garage door.
This is referred to as grounding.
If this is set too short your garage door may not shut all the way or it may slam hard on the ground and go back up.
There may be another sensor near the motor that tells the unit how far to let the garage door go down.