If the door goes up seemingly on its own after you close the door be sure to check for any debris the sensor is picking up.
Garage door reopens when closing.
Most garage door openers have an open and close limit control.
There may also be loose wire connections inside the button housing itself.
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.
They are usually on the motor housing and you access them by opening a panel or removing the housing cover.
The symptom of this is a garage door that is in constant motion opening fully then immediately descending only to start the same cycle again.
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.
If the door stops short of closing lengthen the close limit by turning the control knob in the direction indicated usually counterclockwise.
But changes in weather conditions can causes your garage door components to shift or contract.
Garage doors have many parts that all work together including safety features.
This is almost always the result of a dirty.
Close the garage door with the opener and watch it closely as it closes.
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.
Your garage door is programmed to travel a certain distance before it closes.
Garage doors have sensors that keep them from closing on top of an object so you ll need to check to make sure there isn t something blocking the way.
Check the track and tension spring.
By wade shaddy updated december 19 2018 you push the button to close the garage door.
Scan the safety sensors.
As these wires short against the housing the electrical impulse causes the door opener to activate.
If the garage door does not close completely or begins to close and then opens back up again the down limit switch needs.