Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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I changed the code on the garage door and now the remotes won't open the door. I have to get out of the car and punch in the code. how do I program the remotes.

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Hi,

If you go to the website http://www.liftmaster.com/consumerweb/service/manuals and enter in your model number and serial you can get access to the information to reprogram the remotes ..

"Can't find your instruction manual? Or need programming instructions for a remote control or keyless entry system? Enter the model number of the product manual you are looking for below. Chamberlain® Professional Products has manuals for current models as well as previous models, so we've got you covered no matter what you're looking for."

If thi helps please leave feedback, if not - let me know and I'll try and help some more!

Posted on Feb 01, 2010

  • Seamus Lowe
    Seamus Lowe Jan 06, 2014

    Check online or check with the company that put it in. I had to check with the company I used http://www.smokeysgaragedoor.com)

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