Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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I pres the remot and the door goes up several feet and stops. The only way it goes up is if I hold the remote until completely up.

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Sounds like the door is jamming or possibly needs WD-40 on the tracks and rollers. Also, it might need adjustment on the force on the way up. Be careful and just give it enough to do the job. Let me know if this works.

Cabinetman54

Posted on Nov 19, 2009

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1 Answer

How do I change the frequency of a garage door opener 139.53930ODM?


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Press and hold the two outer buttons on the homelink system in the car until the led flashes rapidly or goes out. Then hold the programmed remote up to the homelink system and at the same time press the button on the remote and the button on the homelink until the led light blinks rapidly or goes out. It should take less than 30 seconds. ----- Then go to the motor head and press the colored learn button on the motor head and go back to the home link and press the homelink button 3 times to activate. If your opener has dip switches stop at -----. Thanks BB

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1 Answer

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Hello.I will be glad to help you out.

Choose which of the 3 buttons you wish to use, on the car.

Take the remote transmitter, depress the actuator button, and continue to hold it until advised to release.

Depress the button, on the car, of your choice, and hold it down until advised to release.

Hold the garage door actuator (while holding the actuator button down) above the car's 3 buttons.

Rotate the door transmitter until the red light above the 3 buttons starts to flash slowly.

Stop moving the remote around when the light flashes slow.

Within several seconds, the same light n the car will now flash rapidly.

Release the car's button, release the transmitter button.

Verify that the door now operates..

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1 Answer

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1 Answer

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