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.
My garage door tries to close instead of open.
It goes partway down reverses direction and goes back up again.
Your logic board needs replaced.
The only problem is that the garage door opener is queued to close when the door is already closed.
To troubleshoot the garage door opener button make sure it s clean and free of debris.
This brain can wear out in time so you could need a replacement.
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.
They are usually on the motor housing and you access them by opening a panel or removing the housing cover.
When the door is lowered the spring winds up tightly creating a pulling force that helps lift the door up.
By manage my life.
You might have absentmindedly unplugged the operator as you were exiting the garage through your internal door to the house.
Many garage doors have a powerful torsion spring located horizontally above the door.
If i remember right typically it keeps track internally where it is in the travel.
This will cause the door to open and close until the button becomes unstuck.
Most garage door openers have an open and close limit control.
You push the button to close the garage door.
There is nothing wrong with the door physically or the installation.
Your garage door s logic board is the brain of your garage door opener.
I just need to know how to switch it to open.
Get logic board replacement.
Your garage door sensor works by having two photo sensitive devices on either side of the garage door.
A careless or rushed parking job can cause the car s bumper to block the sensor.
When the logic board wears out it can cause your garage door to close then open and vice versa without explanation.
In the funniest of scenarios the problem will simply be due to an unplugged power cord.
In order to fix this you ll want to make small changes to the close limit setting until the door opener knows to stop once the door has reached the floor.
So a solution might be to take the chain off the sprocket and run it until it thinks it s all the way open or closed and stops and then put the chain on in the right place for that end of the travel.
If the door stops short of closing lengthen the close limit by turning the control knob in the direction indicated usually counterclockwise.
If your garage door is closing fully and then reversing to open again then it may be due to a problem with the close limit switch.