Possible reasons why your garage door hits the floor then goes back up.
Garage door goes back up when it hits the ground.
Your concrete floormay have lifted so look at that.
My garage door hits the ground then goes back up again.
This is so it won t crush a kid or a person if they happed to be under the garage door when it closes.
There may be another sensor near the motor that tells the unit how far to let the garage door go down.
If the door hits an object when it is closing it will stop and raise back up.
In this case the garage door opener detects that it is coming into contact with.
This issue happens less often than a blocked or off track sensor.
Your travel down setting needs to be adjusted.
You push the button to close the garage door.
I also show how to lock the garage door opener to disa.
This is almost always the result of a dirty or obstructed safety feature.
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.
In this video i show in detail how to get your garage to stay shut if it continues to bounce back up.
This is referred to as grounding.
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.
Garage doors have a pressure sensitive mechanism on them for safety reasons.
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.
As is the case with so many issues at the home there s no one reason why your garage door closes then opens.
Look for two screws on the motor base.
Here s a rundown of some of the possible reasons this can be happening.
To get it to stay down once it hits the ground i push the button on the remote again and it stays down.