Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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We have to automatic remotes, neither willl work, but with the control inside the garage we can operate the door. What do we do?

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If you have a newer model 2000 and after you need to replace the logic board (receiver is bad)
if your opener is older the receiver will be located at the back of the motor, wired with 3 wires to the top, remove this and replace
then reprogram remotes

Posted on Oct 08, 2010

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Posted on Jan 02, 2017

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Door suddenly will not close without holding the button down continuously that is inside the garage. The remote button will open the door but not close it. The door starts to close and stops right away.


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I live in a 4-unit condo building constructed in 2008. Recently, after I trained/programed a garage door opener incorporated in a new car I purchased, I discovered that my garage door started to be...


I would recommend this. I'm not sure this will work, but I think it will.
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FIRST CHECK TO SEE IF THE LOCK/VACATION BUTTON ON THE WALL CONTROL HAS BEEN ACTIVATED. THE LED ON THE WALL CONTROL WILL BE FLASHING. - SIMPLE SOLUTION PUSH THE LOCK BUTTON AND HOLD FOR 2 SECONDS TO TURN OFF LOCK FUNCTION.

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I have just been fitting mine today as well.

Same problem - you have to wire the infra-red bits (I just blue-tacked mine facing each other and wiried them as explained and placed on top of the control box to check this worked)....and it does..

Cheers.

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Assuming, from what I read, the remote works..The inside switch is just a doorbell switch which will wear out or have the contacts get bent or dirty. Take off wall, and change for new one or see if the contacts can be cleaned or adjusted. If the pad is electronic (coded) the wires may be bad or the control defective. Usually momentary contact of the two wires will cause the door to actuate.

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