08:43AM | 02/07/07
Member Since: 02/06/07
4 lifetime posts
I need to change the code in my garage door opener.

It is a Craftsman 1/2 HP Chain Drive with two tramsmitters. I have lost my manual and need to know how to change the code. Please help ASAP!


10:57AM | 02/07/07
Member Since: 04/25/05
1918 lifetime posts
You did not indicate the model of the opener.

There have been at least 3 different types of code systems that have been used over the years.

Chamberlain makes Chamverlain, Liftmaster, and Sears openers. They all use similar parts and proceedures.,1064,uid-jmdpbWViZ2trZg==_652,00.html

Look at #6, #11, and #12


07:26AM | 02/08/07
Member Since: 02/06/07
4 lifetime posts
Sorry. The model number is 139.53648SRT2

The date on it is 08/98


08:08AM | 02/08/07
Member Since: 04/25/05
1918 lifetime posts
You have a Billion Code system. Here are the instruction.


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