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Why does my garage door only go down about 2 feet and then reverse?

I have the 1/2 hp chain-drive Craftsman garage door opener purchased and installed in August 2008. It just started acting odd yesterday. I tried cleaning and aligning the lenses on the safety sensors, but this didn't solve the problem.

1 Answer from this member:
by LYLE W. Earned 10,654 community points in Building Supplies
February 1st, 2009
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