Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Battery replacement on outside key pad opener

How do you replace the battery in the outside key pad opener

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Posted on Sep 03, 2010

  • robert blanchette
    robert blanchette Sep 03, 2010

    There under the number pad is a little door and depending on the model number you will have to take a little screw out and slide it down or insert under it a little screw driver and pop off the cover and replace the battery. You should not have to reprogram this device after. Thanks BB

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I have a Sears Chamberlain garage door opener pad outside my garage. The 9V battery died and I have replaced the battery. How do I reprogram the pad?


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Remote key pad and auto transmitter work intermittently when it is cold outside. What could be the problem? Batteries are all good (tested on volt meter).


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1 Answer

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