Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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We need to reset the code for our Chanberlain Liftmaster garage door opener. How do we do that?

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The old systems use a series of little switches, you set them all to the same setting.

The newer systems use rolling codes and invite process. Have the remotes in your hand, get a ladder and climb up to the opener unit. Read the instructions there, but essentially you press a button on the unit for x seconds (usually short) then press the remote button, and repeat for the 2nd remote.

Some designs you hold the button on the main unit and press the button on the remote, but usually a long press of the button on opener, erases all codes

Posted on Oct 11, 2010

  • kentdee Oct 12, 2010

    We found this helpful but could not get it to work for the 2nd remote.

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