Likely one of the sensors got bumped or moved and it is not lining up correctly.
Garage door will not go down without holding button.
Step by step procedures to try if the garage door of your home will not go down without holding the button before calling a repair man was this video helpful.
If your garage door opens ok but won t close then it s possible the safety reversing sensors are not correctly aligned.
If you ve tried everything listed above and your garage door still won t go down you can try to force it to close.
If the device is equipped to sense resistance when the door goes down there may be something sticking in the mechanism that keeps the drive from working and that causes the door to reverse rapidly.
There should be an adjustment on the unit to set the amount of resistance at which the unit reverses.
Don t just assume that if the path is clear that the sensors are ok.
This problem bugged me for several months.
Adjust the sensors until they line up and allow you to close the door by pressing the button on your remote once.
They can easily become mis aligned due to bumping twisting and loose mounting.
They are there to stop the garage door from closing if there is something in the path of the door.
This method is the only way to override the safety and close the door.
Clutter or obstructions that block the sensor are the first problems to look for if your door won t close or in extreme cases open at all.
On the switch pad located on the wall press and hold the pressure plate for a few seconds.
You will find that the door will only move an inch or so in the close direction and reverse.
First check the sensor lights.
When you can close the door with the wall button by holding it down until it completely closes and the remotes only make the door move a small amount and the door returns that is the sign of the safety sensor system.
When this happens your garage door will only close by holding down on the wall button or wall console until the door fully closes.