Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
Check your owner's manual, but I believe this is standard procedure when the safety beam system isn't working for any reason -- the only way to force the door to close is to manually override with the wall button.
Our house had a lightning strike, and after that, the safety beam was not working. Turns out a diode on the controller board got shorted out, making it so that the safety beam devices weren't getting any power.
So I'm guessing either:
- your safety beam devices are not getting power (check for the LEDs to light up)
- they are getting power but are not aligned and hence think there is something in the way (usually they blink in a way when they think there is something in the way, so this is also easy to test)
- they are flaky (unlikely since they are pretty simple devices, but one never knows!)
- the controller board is misinterpreting the signals. (replacing the controller board is expensive, usually. In my case, I was able to quickly find the fried diode, and $2 later, I have a working garage door again!)
Posted on Jul 15, 2009
Had similar problem. Check the safety beams on both sides of the garage door opener. Check the wiring on the safety beams.
Posted on Sep 17, 2008
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Posted on Jan 02, 2017
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