Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

1 Answer

Garage wont open competely

When door is attached it will not open. will work properly when door is not attached

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  • 5,245 Answers

There is a trip lever along the garage door track.
When door goes up, it trips the lever and turns off the opener.
The trip lever is adjustable. Loosen it and move back 1" or so.
If that is not far enough, move it back 1/2" more.

Posted on Apr 20, 2013

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Door will not work open or close


Dave, Ensure nothing is blocking the safety lights and if they are on align them. If you know there is power to the unit, logic/circuit board is probably bad and needs replaced. Check the attached links,instruction and guides, Good luck
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Sometimes if the clip is not reset then it wont catch the chain mechanism again to open or close the door. If you havent already reset the pull cord clip then that would be my guess. Try closing the garage door reset the clip with the rope attached, push it up til it clicks. and hit the garage door opener button. the rope and clip should move along the track until it hits the arm bracket where the garage door attaches to the chain mechanism.

If that does not do the trick then the clip has some screws on either side of the plastic casing and may need to be loosened and readjusted to match up with the garage door arm bracket and then locked back into place. That should do the trick if all esle fails, you may have to call the door company to come and correct the problem. Hope it works out!

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Operate the door manually. If it is very heavy and wants to close the door is out of balance.
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If the door is good, and the machine runs full cycle without the door attached, reattach the door and adjust the "Up Force" adjustment on the end of the machine with the wiring. With proper operating equipment (door, GDO), it should be no more than 6 O'clock. Any higher than that, and the door likely requires servicing.

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