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

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My craftsman 1/2 hp garage door starts to close and then opens up

Craftsman 1/2 hp garage door opener, push button, closes about an inch, then goes back up. If I hold the button it will go down. This is an older unit, has a force sensor, but no beam sensors. Door opens and closes smoothly if releaseed from chain (no binding), and I have tried to adjust down force. It was set high enough that chain went slack when it tried to close on a 4 x 4. Is there some board or something that could have gone bad? Is there something to bypass the beam sensors? Thanks.

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I had a simular issue, except mine was that the previous owner decided to mess with all the settings and mounts and screwed everything up.

The problem isn't your force sensors its your downwards stopping sensor on the opposite side of the opener. For me I had to take the entire panel off and replace the sensor back in its holder, but try adjusting that sensor setting (clockwise goes down, counterclockwise goes up).

If that doesn't work then i dunno:)

Also set both force settings in between 0-1, for some reason with mine if i set it higher it would set them off....

Posted on Jul 19, 2009

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