Garage door sensor light not glowing? Check the wire
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Transcript
One sensor light not glowing? It may not be alignment. The Chamberlain manual says both lights glow steadily if the sensors are aligned and wired correctly. So look along the wire from each sensor. Anything pinched? Anything pulled loose? Just look. Don't take anything apart. The manual says make sure the sensor wire is not shorted or broken. Genie's support page says to check for loose wires too. A cut or damaged wire is a job for a technician. The full guide is on garagedoorscience.com.