Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Lights flashing on opener and will not open the door. the car remotes work

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If you have a vacation lock on the wall button it might be engaged, or the up force on the motor might need to be increased. If not you may be looking at a logic board replacement. Thanks BB

Posted on Sep 05, 2010

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Posted on Jan 02, 2017

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My garage door opener remote does not work.I have a craftsman garage door opener manufactured in 1999. The garage door opener remote panel has a green light on and will open the garage door. The remote,...


Make sure the green light in the wall control is not flashing. That locks out the remote. If it is press and hold for 3 seconds the lock button on the wall control. It could just be that your remote has failed.

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Craftsman Model 139.53684 Security+ Keyless Entry Garage Door Opener... Green light flashing on door control push button. Remotes no longer work. Can open and close garage door from keypad. Why is light...


To answer your question the opener is in vacation mode. Press and hold for 3 seconds the button on your wall control with the lock icon. The green light will stop flashing and you will be back in business.

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Programming remote, unit will not flash.


The easiest way to program is to hold the button on the remote while you press and immediately release the smart/learn button. If it worked before there is no reason for it not to work now unless it totally failed.

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WHEN YOU CHANGE THE BATTERY NO NEED TO REPROGRAM THE REMOTE.
THE FLASHING LIGHT TELLS YOU IT IS SENDING A SIGNAL THAT IS BEING RECIEVED IT IS JUST NOT THE CORRECT CODE TO OPEN THE DOOR.
REPROGRAMING THE REMOTE SHOULD SOLVE THE PROBLEM

HOPE THIS HELPS

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sounds like it blew the reciever crystal buy another and return the motor thats fried 4 refund

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Remote does not open garage door


It sounds like the wall button has the lock feature engauged.

Is there a small green LED flashing inside the wall button?
Push and hold the lock button for about two seconds and the LED should stop flashing. This will unlock the garage door opener and your remotes should start working. You may have to reprogram your remotes and homelink again since you triedprograming in the lock mode.

Good luck.

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Garage door only opens with wall unit


a component in the wall unit is failing , that makes the conection happen when the remote signal is recieved , ( it is recieving the remote signal but not sending it out to the control circuit for the motor )

Dec 29, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage Door only opens with wall unitq


The unit is in the lock mode, push and hold the lock button in for about two seconds and the green LED should stop flashing. Your remotes should work.

Dec 29, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Remote key will not open door


hi, gareth hear
i think this mite work 4 u

get in your car and put key in ignition turn 1 turn then wait approx 15 20 secs for light in clock to go red then take key out light should stay lit, next get out of your car close door then lock it and open it, when u open car light in clock should flash 3 times, next get out of car hold lock button on your remote down and push open button 3 times (keeping lock button down and remote pointed at reciver) next lose go of both buttons and red light on key should flash 3 times at the same time as clock inside the car.
next get in your car with key! then start her up and turn off get out of car close door and push button to lock (it should lock) if not get back in start her up again and turn off, then push the door locks inside the car then open get out and your car will lock this time!!!!!!!

this will work 4 u!!!

good luck

Dec 14, 2008 | Code-Alarm Code Alarm Transponder

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