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

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Battery does not last

Genie garage door will start going up and down by itself, thought it was the Genie but changed the 9volt battery in the Chamberlain outside key pad (which is inside the garage) and problem quit. But the new battery will last only a week and opener starts to go up and down again. Changing the battery solves this problem, but, battery only last about a week and problem starts again until I put another new 9 volt battery in the unit. Why?

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Anytime a door opens and/or closes randomly or doesn’t work consistently 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 or interfere with the remote signal.

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 / interference 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.

HOPE THIS HELPS

Posted on May 30, 2010

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