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sounds like the sensitivity needs adjustment

Posted by LJ in TX on December 1st, 2002 12:59 PM
In reply to Craftsman Garage Door Openor (Model 139.53500) by Dick McCarte on December 1st, 2002 12:26 PM [Go to top of thread]

the feature that causes the door to drive back up if it were to inadvertently close on someones head if they were to be walking under it while it was closing. if the adjustment is set too sensitively does not take much sensing that it appears to have hit something blocking its downward motion to cause it to re-open the door. check your manual to see where and how to make the adjustment for your particular opener. LJ

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