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How to change horizon(Best) alarm code

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  • 25-01-2012 7:46pm
    #1
    mudxfxa
    Registered Users Posts: 73 ✭✭


    Hi:

    Could anyone let me know how to change the horizon alarm arming and disarming code?

    It's about 20 years old and has a "Best" sign on the box.

    Many Thanks


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