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What does the yellow light on the back of my 1/2 horsepower Craftsman garage door opener mean?

The door closes and then opens right back up by itself. It only opens 10 to 12 inches. It will not open all of the way. The yellow light on the back keeps blinking.

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1 Answer from this member:
by LYLE W. Earned 6,476 community points in Craftsman
September 10th, 2009
Sarah Brown
I had a similar problem and with the info posted above I was able to fix our door! So, thankful and happy!
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