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I just installed a Craftsman 1/2 HP garage door opener and everything works fine except the light / door sensors. After the door has opened and the light remains on for about 4 1/2 minutes, it goes out as expected. But....with the door open, if something breaks the sensor's beam, the light comes back on ( kinda of like a motion detector) and remains on for another 4 1/2 minutes and this activity repeatsd itself over and over again.
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