If the door stops short of closing lengthen the close limit by turning the control knob in the direction indicated usually counterclockwise.
Garage door close then open up again.
They are usually on the motor housing and you access them by opening a panel or removing the housing cover.
This is almost always the result of a dirty or obstructed safety feature.
A careless or rushed parking job can cause the car s bumper to block the sensor.
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.
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.
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.
The garage door will automatically go in reverse whenever it hits an obstruction such as the driveway or ground.
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.
When the logic board wears out it can cause your garage door to close then open and vice versa without explanation.
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 brain can wear out in time so you could need a replacement.
Your garage door s logic board is the brain of your garage door opener.
Get logic board replacement.
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.
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.
You push the button to close the garage door.
It goes partway down reverses direction and goes back up again.
Measure the distance of the gap from the bottom of the.
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.