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

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When it gets cold green sensor lights go off and

Model 139.53672. Sensor 41a4373a.
when it gets cold green sensor lights go off and security pad will not open garage door when code is entered. otherwise unit works ok in warmer weather.

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  • Don Maggard May 11, 2010

    What about your remotes? Do they still work?

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  • Master
  • 3,197 Answers

Sounds like you have a bad security pad.

Posted on Oct 05, 2009

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Garage door opener


The green eye receives the the signal from the Amber side. When is not on the sensors won't work. As far as the cold chamberlain did have a few issues with sensors not working or intermediate issues in cold weather. Their solution was to replace the sensors. But before you do that check everywhere the wires are stapled. Make sure that they are not pinching the wires.

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If your sensors are not pointed at one another the light on one of them will go out. Tweak them a bit. If you cannot get the light to come on then your sensors are bad.

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IF IT STILL FLASHES 5 TIMES AND MOVES 6-8 INCHES REPLACE RPM SENSOR.

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One sensor should always be yellow, the other should be SOLID green.
If the lights are not consistently SOLID, you have a sensor issue.
TEST: If the door closes completely by pressing and holding down the wall pad button, you have a sensor problem.

Check to make sure the are aimed properly at each other.
Check the wire at the sensor and more importantly at the machine (If the wires are loose at the machine (terminals) it can cause this problem. Remember the machine does shake a lot.
If the wires are good, the sensors are aimed correctly, you have a sensor issue and need to loacte a replacement set.

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Check the electric eyes. If they don't see each other the door thinks there's something in the way. Blinking light is a safety alert to check the travel path.

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The colour on the sensors doesn't change.
One is orange constantly and the other is green when detecting a signal from the orange sensor.
If the green is flickering, they are not adjusted correctly.Move the green sensor until you get a good solid green. Holding the wall pad button down, just bypasses the sensors.

Try adjusting only the sensors so that they are solid.

In addition, check the little yellow light on the back of the machine and count the flashes.
The number of flashes will tell you what the error is in your manual.

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