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

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Liftmaster formula 1 garage door opener keeps "bouncing" open

When I try to close the garage the door hits bottom and keeps bouncing back up. One of the sensors is green, the other is amber/yellow. I've unscrewed the amber yellow and tried to realign. Nothing works. I can point it straight down and it is still amber/yellow. I'm sure this sensor is a big part of my problem but don't know how to proceed. any ideas?

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If the door reverses when it hits the floor it is traveling too far. Locate the 'down limit' control on the side of the motor unit and turn this in the opposite direction of the arrow printed on the cover. Some tweaking will most likely be necessary. You can always recognize a sensor problem because the main light will flash 10 times. If the main light isn't flashing it isn't a sensor problem.

Posted on Sep 28, 2009

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Hello,

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