Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

1 Answer

My lift master garage opener opens randomly

This issue started a couple of days ago.

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  • Anonymous Dec 09, 2008

    1/3 liftmaster that drags and stops i/2 way up. It will open if I push it up.

  • ss1967 Jan 10, 2009

    I have the same problem.

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1 Answer

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  • Master
  • 1,605 Answers

Change the security code in the opener and the remote.
seems like omeone in your are have the same frequency remote.

Posted on Nov 13, 2008

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Posted on Jan 02, 2017

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1 Answer

Lift master formula I will not close, only goes half way down, but fully opens. Worked fine until my wife closed the door on the car, after that it would fully close


I had this problem as well with the door opening just fine but was not closing when using the remotes or when breifly pressing the wall mounted control. The door would close only when using the wired wall mount control. I have experienced this problem with other garage door openers I've had in my previous homes and it was always caused by sensors at the bottom of the door tracks being either misaligned or the lenses were dirty. In this case, and it was just a moment ago today, I simply cleaned the sensor lenses and then the door began to function properly. Give it a try.

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Door randomly open lift master 1/3 hp


Unplug the unit for 3 mins then replug. (Resets the memory)

Feb 18, 2011 | liftmaster Chamberlain Garage Door Opener...

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I have liftmaster garage door opener P/N 41A-5483-4. It worked normally. but all of sudden, when door closing, it reverses automatically at half way down, and garage door light bulb starts blicking 6...


Use the pull cord and disconnect the opener from the door. Operate the opener and let the carrier slide back away from the door. Is the carrier moving smoothly when disconnected? Next, lift the door by hand from the bottom to the top. Is it moving smoothly? If not, lubricate the axles of all the rollers on both sides of the door. Check the cable pulleys at the top sides of the door channel, lubricate them as well. Are all cables in all the pulleys, there are 4. After checking those things, there is a "up force" and "down force" adjustment on the opener, try increasing the "up force" by turning the adjustment in the direction of MORE force.

LiftMaster Garage Door Opener Frequently Asked Questions

Jan 02, 2011 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Help, my Lift-Master garage door opens 2-3 ft


SOUND LIKE A BROKEN SPRING.
LOOK ABOVE THE DOOR IF THERE IS A GAP IN THE SPRING IT NEEDS TO BE REPLACED,
I DO NOT RECOMEND THIS AS A DIY JOB. THEY ARE UNDER MUCH TENSION AND CAN COST YOU FINGERS IF YOU DON'T KNOW WHATYOU ARE DOING - CALL A PRO

HOPE THIS HELPS

Apr 10, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Lift master Garage doors the door doesn't close. once i press the button to close my garage door it shuts the door momentarily and then it opens right back up by itself. nothing is blocking the sensors.


Too much tension on the door can make the "brain" respond by opening the door, thinks something is in the way.... check for binding tracks or wheel guides, loose bolts, dry chain, tension on cables or springs ( be careful here), misaligned sensors....

Apr 06, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Door will not open with wall switch or remote


Depending on the type of motor that is used in your garage door opener, it could be something as small as a start capacitor, or potentially a bad motor. Hope this helps

Aug 17, 2009 | liftmaster Chamberlain Garage Door Opener...

3 Answers

Lift-Master garage door opener stopped working


The motor will probably need rewinding.
Professional job. Don't forget to take the condensor with the motor.
Or alternatively, if money isn't a problem,, get somebody out to look at it.
There ya go:)

Jul 27, 2009 | liftmaster Chamberlain Garage Door Opener...

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