Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Installed new opener and everything worked properly. 2days later the safety sensor doesn't work. The amber and green lights are not lit and the door won't go down. This is a Chamberiain 1/2 hp chain drive. The blinking indicator says it's the safety sensor. Did they short out or did a circut board go?

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If you haven't yet, double check the wiring on the back of the motor unit. A wire could have broken or just come loose. If your opener is new it will be in warranty.

Posted on Sep 28, 2009

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Check the wiring. when you installed the new sensors did you run all new wire? Sometimes during an installation the installer staples the wires to the wall then across the cieling to the opener. Sometimes the stapler will pierce the wires or be too tight and over time a short will occur. If all the wires are exposed (you can see them) slide them abit and see if theres a really tight one. (Helpfull if you have an assistant stare at the sensors to see if something happens). If thier buried in the wall then run new wires. Sometimes the drywallers will hit a wire with a screw when thier doing thier job.

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