Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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My liftmaster will not open or close with either remote or the key pad. I only can get it to go down if I hold the wall mounted door control button down for the entire closing. The door then imediately opens back up as it touches the ground. The problems started as the temperature went from 25 to 55. My contractor suggested that I add another bracket to the opener to stabilize a little better due to the sensitivity. Any suggestion?? Doug

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Check the aiming of the sensors at the bottom of the door. The little led lights shoud come on when aimed properly.

Posted on Jan 16, 2011

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