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

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GARAGE DOOR OPENS AND CLOSES ON OWN LT BLINKS SEVERAL TIMES

AFTER A RECENT STORM MY CRAFTSMAN DOOR OPENER (OLDER 1986 MODEL) STARTED TO OPEN AND CLOSE ON ITS OWN WHEN I WENT OUT AND TRIED THE REMOTE AND THE WALL PAD THE MOTOR BUZZED AND THE LIGHT BLINKED SEVERAL TIMES, BUT THE DOOR DIDN'T RESPOND. I FINALLY GOT THE DOOR DOWN AND POWERED OFF. THE OWNER'S MANUAL DOES NOT SAY WHAT THE BLINKING LIGHT SIGNALS. I'M AFRAID IF I TURN IT BACK ON IT WILL BE DOING THE SAME THING OR IT WONT CLOSE. HELP. THANKS AG56

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Anytime a door opens and/or closes by itself I look for a smashed wire between the motor unit and the wall button.

If the wire is smashed the insulation becomes so thin that power will leak thru the insulation and activate the door.

Loosen the staples with a small screwdriver and slide the wire about ½ inch to move any areas of thin insulation away from the staples.

The second thing would be a bad wall button or a remote with a sticking button.
Or a remote in someone’s purse that gets the button pushed by other stuff in the purse.

The test is to disconnect the push button wires at the power unit. If the self operation stops you have located the problem. If you reconnect the wires and disconnect the wire at the wall button this will tell you if the problem is the wire or the button.

This can also interfere with remote controls

HOPE THIS HELPS

Posted on May 29, 2010

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