Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Our darling grandchild decided to lock our door with us unaware, last night we came home tried to open the door, it tried to go up and down about 15 times. The door will close but won't stay closed and the door won't open completely. HELP!!!!

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Check the power supply box for a reset switch, or unplug the power for 5 minutes, that may reset the door

Posted on Jul 22, 2009

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