A garage door opener operating on its own may be caused by several problems.
Garage door open for no reason.
One day said door opens by itself for no apparent reason.
In the funniest of scenarios the problem will simply be due to an unplugged power cord.
Your garage door s logic board is the brain of your garage door opener.
When the door closes halfway but then reverses for no apparent reason this may be a sign that there is something preventing it from closing something that you can t see.
This brain can wear out in time so you could need a replacement.
Get logic board replacement.
If you think this may be the cause of your garage door not opening call a garage door technician to come and take a look at it.
The frequency used in older garage door openers could interfere with certain military planes.
You push the button to close the garage door.
It happens to almost everyone with an automatic garage door.
When the logic board wears out it can cause your garage door to close then open and vice versa without explanation.
This is almost always the result of a dirty or obstructed safety feature.
To correct many people s misimpression we should point out that it all depends on the frequency used by the door opener.
The sooner you determine the cause the better.
You might have absentmindedly unplugged the operator as you were exiting the garage through your internal door to the house.
This will cause the door to open and close until the button becomes unstuck.
These issues include shorts in the wall button the garage door opener remote the wall button wiring the wired keypad or other related electronic issues.
Garage doors are heavy and trying to replace a broken spring on your own can be dangerous.
You can often times see the spring broken but don t try to touch it investigate.
Besides a short in the circuit board any number of mechanisms that are involved in making the door open and close could be the cause of the garage door opener s ghost movement.
Likely culprits include the wires the internal circuitry and more.
It goes partway down reverses direction and goes back up again.
A garage door that spontaneously opens unfortunately leaves your home vulnerable to theft assorted critters and the elements.
Clean the button as well as the connections in the housing if this is the case.
The button can easily get dirty and stuck in the pushed position.
To troubleshoot the garage door opener button make sure it s clean and free of debris.