Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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We have a Liftmaster garage door opener. I bought a new remote control for it - a Liftmaster security plus. I have tried to program it by pressing the button on the garage door opener, then pressing the button on the new remote, but the opener doesn't blink or click. It doesn't work. I do it with my old remotes and it programs fine. What could be wrong?

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YOU NEED TO MAKE SURE YOUR REMOTE IS THE SAME FREQUENCY AS THE EXISTING UNITS.

IF YOU LOOK ON THE BACK OF THE REMOTE THERE SHOULD BE A FREQ# IF THEY ARE NOT THE SAME YOU NEED TO EXCHANGE THE REMOTE.

HOPE THIS HELPS

Posted on Mar 30, 2011

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1 Answer

Liftmaster security + remotes do not operate. I bought 2 new remotes and neither one of them will program to operate the opener either.


Yes it sounds like the board. Make sure the opener is not in lock. If the light in the wall control is blinking press and hold the lock button for 3 seconds.

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To erase the memory of the opener so that your old remote will no longer work you need to locate the smart/learn button on the rear of the motor unit. Press and hold this button for 6 seconds. No remotes will now work.

To program the new remote when you get it, hold the button down on the remote and then press and immediately release the smart/learn button.

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GET A CHAMBERLAIN OR LIFTMASTER SECURITY PLUS.

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didnt try everything cause if you did, it would work! Get two people and garage door opener. One read manual from car under Garage door" or Homelink while other pushes button. When manual says if this did not work or if you have security plus or rolling code, continue with other instructions. You will need a working remote and will need to pushh learn button on motor logic board.

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sounds like you are doing keypad ok. is battery good. as far as homelink in car. follow directions for rolling code/security plus.

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