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.
Residential garage door goes down but goes back up unexpectedly.
Garage doors have many parts that all work together including safety features.
This is almost always the result of a dirty or obstructed safety feature.
Not only are there many different types of garage doors and garage door openers but these are actually very complicated devices despite its name your garage door opener is actually a series of different systems connected together.
These garage doors have sensors near the ground to ensure nothing gets stuck underneath the door when it closes.
In cases like this your travel down setting simply needs to be adjusted to the new distance.
It goes partway down reverses direction and goes back up again.
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You push the button to close the garage door.
When a garage door descends on command but then immediately reverses itself the problem is usually with the sensor eyes along the side tracks or with the door s wheels binding in their tracks.
Because a garage door opener is a complicated creature there s a lot that can possibly go wrong.
Your limit switch needs to be adjusted.
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.
A careless or rushed parking job can cause the car s bumper to block the sensor.
But changes in weather conditions can causes your garage door components to shift or contract.
But when the door begins to descend all on its own the problem may point to the opener s logic board or the circuitry inside the motor unit itself.