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

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My mom & I each have a Craftsman garage door opener at our respective homes & live @ 15 minutes apart. Our openers are about 13 to 14 yrs old. The past two yrs. we've both had the same problem. The openers work fine when the temperature is above 50 degrees. But as soon as it goes below that outside, when you press the wall or remote switches, the door starts to go down, then goes back up & the light blinks a couple times. You can close the door if you hold the wall switch in til the door closes completely, but if you let the pressure off the switch before the door is completely closed, it goes back up again & the light blinks. The openers both work fine in summer, but now we are getting into winter & its started again at both our houses. The "sensors" show solid green lights, so that does not seem to be the problem. Do you know what the problem is? Thank you.

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If the main light flashes 10 times when the door reverses to the open position it is a door sensor problem. Make sure both lights on the sensors stay on and don't flicker while the door is moving and the sensors are firmly attached so they don't move. Tweak them just a bit.

Posted on Nov 10, 2010

  • Peg Lydon Nov 27, 2010

    But if its a sensor problem, why doesn't the problem occur when the temps are above 50 degrees? The door works fine when temps are above 50 degrees.

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