To lock the door from the outside to lock the slide lock from the outside you need to install a lock handle with the spindle inserted into the square hole next to the operating lever.
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You ll also need to have the corresponding key.
All electronic or automatic garage doors have a bypass that will allow you to open it manually.
To open it up all you need to do is thread a coat hanger or hooked piece of wire through the top of the door and open the emergency latch which can also be done by the rope many emergency latches.
The garage door emergency release cord is usually a red rope with a red pull handle and you will find it on the opener rail near your door.
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To reset it begin by pulling the cord in the opposite direction.
Once this happens you can open and close the door electronically.
Centered near the top of your garage door you should find a small lock.
This disengages the electric drive from the door and you can manually open and close it.
This will turn the operating lever and extend the bolt into the locked position.
The cord allows you to disengage your garage door from the opener allowing you to open it manually.
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This lock stores an emergency release cable.
Once installed turn the handle 90 degrees to lock the slide lock.
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To manually open most garage doors you simply pull a corded handle that is attached to the door.
It should click in place.