Manually i can raise and lower the door without any problems.
Garage door opener goes down then back up.
Your travel down setting needs to be adjusted.
Here are some symptoms of the problem.
The garage door will automatically go in reverse.
Your garage door opens immediately after closing.
Your garage door opens when it hits the ground.
Turn off the sure lock aka vacation mode on the wall console check if limits are properly set check the door balance condition and door spring check opening force control or force settings.
Possible reasons why your garage door hits the floor then goes back up.
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.
You push the button to close the garage door.
It goes partway down reverses direction and goes back up again.
If i dis connect the door from the chain it still does the same thing.
As is the case with so many issues at the home there s no one reason why your garage door closes then opens.
The garage door goes down then back up.
Even if i hold the button down the garage door returns up after a foot or so.
The garage door keeps going up and down.