How To Lock Garage Door When Power Is Out. Please note that you should only use this method if the garage door is fully closed. Keep your garage door completely at the down or closed position:
It can work with either manual or automatic garage doors and integrates in with virtually all automatic garage openers. If your garage door has two different buttons that are used to open and close the garage door, simply click on the one that would typically close the door. Be it latches, locks or any kind of external switches.
Make sure the garage door is closed all the way.
Switching to manual mode step 1: Disconnect power from the garage door opener: Opening the garage door with the lock bar in place can cause major damage. When the power comes back on you will need to reconnect the garage door to the track and motor.