Your limit switch needs to be adjusted.
Residential garage door goes down but goes back up unexpectedly.
It goes partway down reverses direction and goes back up again.
But changes in weather conditions can causes your garage door components to shift or contract.
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.
This is almost always the result of a dirty or obstructed safety feature.
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.
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.
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.
A careless or rushed parking job can cause the car s bumper to block the sensor.
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.
Garage doors have many parts that all work together including safety features.
When that happens the distance your garage door needs to travel may change.
Because a garage door opener is a complicated creature there s a lot that can possibly go wrong.
Your garage door sensor works by having two photo sensitive devices on either side of the garage door.
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.