If it moves all the way up now then the trolley should be okay.
Garage door opener goes down a little then back up.
If the door seems okay there may be a problem with the trolley or the opener itself.
There may be two nuts on one track.
It goes partway down reverses direction and goes back up again.
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.
Try running the opener with the door still disconnected.
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.
If the door hits something hard it will reverse.
Possible reasons why your garage door hits the floor then goes back up as is the case with so many issues at the home there s no one reason why your garage door closes then opens.
See if you can find a manual online and go throught the setup steps again.
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.
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 reverses and the lights blink 10 times there s still a problem with the sensors or something tripped them on the way down.
Here s a rundown of some of the possible reasons this can be happening.
You push the button to close the garage door.
A careless or rushed parking job can cause the car s bumper to block the sensor.
Garage door only travels a little way and then reverses does your garage door only travel a little way 6 inches or so and then reverse.
Check all of you conenctions and the installation of the new logic board.
One for the opening limit and one for the closing limit.
If the door had hit a stop it would not have reversed.
This is almost always the result of a dirty or obstructed safety feature.
The garage door will automatically go in reverse.
Your travel down setting needs to be adjusted.
By adjusting the starting position of whichever nut the opening and closing limits are set.
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.