This is done with the help of sensors in the motor and on each side of the opening near the floor and mounted on the tracks.
My garage door closes then reopens.
If the garage door does not close completely or begins to close and then opens back up again the down limit switch needs.
Inspect the control wiring.
In rare instances a nearby neighbor may have a garage door opener set to the same wireless.
If it closes only partway the safety sensors are usually responsible clean the lenses or realign them and make sure there are no obstacles blocking the beam.
If your garage door won t open or close the problem could be a bent track a broken torsion spring or a bad capacitor int he motor housing.
Your garage door is programmed to travel a certain distance before it closes.
An exposed spot or a short circuit in the small gauge wire that leads from the garage.
Close the garage door with the opener and watch it closely as it closes.
In garage door operators made after 1993 there are required safety features that open the door during the close cycle when they detect something blocking the door.
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.
This is almost always the result of a dirty or obstructed safety feature.
It goes partway down reverses direction and goes back up again.
If it closes before that distance has been traveled it thinks something is wrong and it reopens to help prevent any damage or safety risk.