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.
Garage door close then open up again.
If the garage door does not close completely or begins to close and then opens back up again the down limit switch needs to be adjusted.
This is almost always the result of a dirty or obstructed safety feature.
They are usually on the motor housing and you access them by opening a panel or removing the housing cover.
If the door stops short of closing lengthen the close limit by turning the control knob in the direction indicated usually counterclockwise.
Your logic board needs replaced.
My chamberlain garage door opener system 1 2 hp seems to be malfunctioning just recently when the door closes it reaches the floor and then goes all the way back up again after several attempt.
When the logic board wears out it can cause your garage door to close then open and vice versa without explanation.
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.
Most garage door openers have an open and close limit control.
The garage door will automatically go in reverse whenever it hits an obstruction such as the driveway or ground.
Get logic board replacement.
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.
Measure the distance of the gap from the bottom of the.
Your garage door sensor works by having two photo sensitive devices on either side of the garage door.
Your garage door s logic board is the brain of your garage door opener.
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.
This brain can wear out in time so you could need a replacement.
It goes partway down reverses direction and goes back up again.
If you re craftsman chamberlain etc garage door opener is closing and then opening up its likely a common problem related to the stop limit mechanism.