If that point is more than four feet or less than three feet above the ground you will need to balance the door.
Garage door bouncing up.
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.
Your garage door s logic board is the brain of your garage door opener.
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T his is a pretty uncommon problem but one that can happen after you ve first installed your garage door opener.
To know how to balance a garage door first disengage the opener from the door by pulling the opener release handle see opening photo.
Your garage door sensor works by having two photo sensitive devices on either side of the garage door.
This is related to the up limit switch.
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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.
You push the button to close the garage door.
Then lower the door about halfway.
2 brace the open door.
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.
Get logic board replacement.
This brain can wear out in time so you could need a replacement.
A properly balanced door will hold the halfway position without assistance.
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.
It goes partway down reverses direction and goes back up again.
If the door rides back up the springs are under too much tension.