If your liftmaster garage door is stuck and won t open it is possible to troubleshoot it in a variety of ways.
Liftmaster professional garage door opener won t close.
Unplug the opener and reconnect the wires to the red and white terminals or 1 and 2 screw terminals.
This will cause the trolley to move into position and reconnect to the garage door.
The light will flash two times.
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There is a screw under the push button that holds the door control on the wall.
Sometimes can be misinterpre.
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Liftmaster uses the protector system which projects an invisible light beam across the door opening and automatically opens the door if something someone crosses it s path.
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Try opening the garage door with the remote and see what happens.
If your garage door doesn t open or close it could be this force control adjustment.
Test the remote.
Press the lock button to turn this feature off.
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To reconnect the garage door to your liftmaster garage door opener manually close the garage door pull the emergency release handle down.
Remove the wires from the back of the door control.
When the lock button is on the garage door opener will work from the door control but the remote controls are locked out.
Fortunately resolving many of these problems can be done safely by the layperson and doesn t require specialized tools.
Go to the door control take the door control off the wall by popping off the push button.
If your door control has a lock button it may have been turned on.