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.
Garage door bouncing up.
Get logic board replacement.
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Your garage door sensor works by having two photo sensitive devices on either side of the garage door.
When the logic board wears out it can cause your garage door to close then open and vice versa without explanation.
A properly balanced door will hold the halfway position without assistance.
Your garage door s logic board is the brain of your garage door opener.
This brain can wear out in time so you could need a replacement.
This is almost always the result of a dirty or obstructed safety feature.
Move the garage door up and down until you find a place where the door stays suspended when you let go.
If that point is more than four feet or less than three feet above the ground you will need to balance the door.
This is related to the up limit switch.
You push the button to close the garage door.
2 brace the open door.
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.
Try making small adjustments.
It s important to get this switch at just the right distance from the motor so that the door is able to close all the way but the motor also knows to stop running.
To know how to balance a garage door first disengage the opener from the door by pulling the opener release handle see opening photo.
It goes partway down reverses direction and goes back up again.
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Then lower the door about halfway.