Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Liftmaster Chamberlain Garage Door Opener Transmitter 300MC: door only closes when button is held down at main ...

Door only closes when button is held down at main unit

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  • Anonymous Mar 27, 2014

    my digidoor 3 garage door motor wont respond to the wall or hand held transmitter. The light on motor comes on, but makes a beep sound without responding.

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99% SURE IT IS THE SAFETY EYES - ALIGNMENT, WIRING, OR BAD EYES

HOPE THIS HELPS

Posted on May 26, 2010

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Posted on Jan 02, 2017

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How to synch remotes on a Liftmaster 1/2 HP Security + garage Door opener


Click the learn button on the receiver followed by the remote. See e.g. http://www.liftmaster.com/CatalogResourcesV3/en-us/shared/files/tucmanuals/114A4109.pdf

Jul 25, 2014 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Liftmaster Chamberlain Garage Door Opener Transmitter 300MC: I'm tryin to connect the sensors on my garage open...


IF YOU HAVE THREE SCREWS THE WALL BUTTON GOES TO 1 AND 2

THE EYES
THE WHITE WIRES W/BLACK LINE GOES TO 3
THE PLAIN WHITE WIRES GO TO 2

IF YOU HAVE SLIDE IN QUICK CONNECT THE WALL BUTTON GOES WHITE WITH RED TRACE TO RED.
THE SAFETY EYES WHITE WITH BLACK TRACE GOES TO GRAY PLAIN WHITE GOES TO WHITE

HOPE THIS HELPS

May 18, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Liftmaster Chamberlain Garage Door Opener Transmitter 300MC: Light keeps on flashing on the motor...


how many flashes
1-safety sensor wire broken
2-safety senor wire shorted or reversed
3-door control or wire short
4-safety sensors mis aligned
5-motor overheated or bad RPM sensor
6-circut failure, bad logic board

May 17, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

My Liftmaster 1/2 H.P. opens but cannot be closed (without depressing the button on the wall until the garage door comes down all the way. Any help will be much appreciated


HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.
WHEN HOLDING IT DOWN MAKES THE DOOR CLOSE PROPERLY THE PROBLEM IS IN THE SAFETY EYES.

ARE BOTH LEDS ON? - CHECK FOR A LOOSE OR BROKEN WIRE.
ARE THE EYES WIRED CORRECTLY?
ARE THEY AIMED AT EACH OTHER?

Jan 25, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Door will not come down when using the remote. I have to use the main switch in the garage to bring it down and must hold the button until the door is all the way down.


HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.
WHEN HOLDING IT DOWN MAKES THE DOOR CLOSE PROPERLY THE PROBLEM IS IN THE SAFETY EYES.

ARE BOTH LEDS ON? - CHECK FOR A LOOSE OR BROKEN WIRE.
ARE THE EYES WIRED CORRECTLY?
ARE THEY AIMED AT EACH OTHER?

Jan 19, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Door won't close unless I hold the button all the way down.


make sure the eyes are clean and aligned if the opener thinks something is obstructing its path it will not close

Oct 07, 2009 | liftmaster Chamberlain Garage Door Opener...

1 Answer

I have 2 liftmaster 3245. The hand held remotes were working fine then stopped. I replaced the batteries and turned of all electrical/RIF close by. Still not working. Both cars operate the doors with no...


You need to reprogram the remotes by briefly pushing the learn button on the garage door opener until it flashes once, then release the button on the garage door opener.

Now press the remote button once until you hear the garage door opener click, now press the remote button once again and the remote should be programmed to work for that garage door opener.

DO NOT press and hold the garage door opener learn button for more than 10 seconds or you'll erase all programs and have to relearn all the remotes, including your car ones.

Hope you found this very helpful and best regards.

Aug 06, 2009 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Garage door opens/closes by neighbor


Your code may be teh same or close to you neighbors. I'd change to another code. Takes 5 minutes

Jul 19, 2009 | liftmaster Chamberlain Garage Door Opener...

1 Answer

My garage door will not close unless...


Check your down limit switch and even your up one too almost sounds like one is stuck one way or the other.

Jun 19, 2009 | liftmaster Chamberlain Garage Door Opener...

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