Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
The garage door starts to close but then backs off as if the sensor is tripped. This consistently happens every time the door closes at a certain point (approximately 1 foot from the bottom and no there is nothing protruding from the door that is tripping the sensor). This inconsistently happens at various other points along the path.
the sensors are clean. I cannot tell if they are pointed directly at one another, but they are very firmly in place. This problem just started happening recently. Opener is about 9 years old now.
I just had this problem and I cleaned the sensors and made sure all the lights on the sensors were on. They were but yet the propblem persisted.
I checked all the wires and found that the wires were touching where they went into the unit. I separated them and all is working fine now.
Posted on Aug 12, 2009
Have you adjusted your sensitivity regulator screw found on the motor box? I had the same issue. Would open only so far and then would do an auto open once it closed so far. Adjusted the 2 screws (*One* for the Upward Motion *Second* for Downward motion) and this did resolve the issue...Good luck!
Posted on Mar 07, 2009
For the guy who has the problem with the sensor acting like it is tripping try this.If a wire on one of the sensors is not connecting well, it will make the light on the sensor go off, the sensor that is operating won't recognize the other sensor which can cause it to think there is something blocking it. Try jiggling the wire on each one to make sure the wire is getting good connection. You will see the light on the sensor blink off and on if its doing this. The light on the sensor has to stay on for it to be working properly. Ive seen this happen twice in the last year and I dont work on them for a living:) good luck
Posted on Jan 08, 2008
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Posted on Jan 02, 2017
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