This replacement kit is used to shield sunlight and prevent accidental reversal of garage door from sunlight shinning directly into the safety reversing sensors. A ray of sunlight can trick the garage door opener sensors into thinking there s something in the door s path preventing the door from closing. Chamberlain liftmaster craftsman garage door opener replacement safety sensors g801cb p includes 2 sensors mounting brackets and hardware 4 7 out of 5 stars 1 724 garage door opener liftmaster 41b873 saftey sensor sunblocker shield 41a5034.
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