Question about Craftsman 1/2 HP CHain Drive Garage Door Opener with Security Anti-Burglary Coding

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We installed the opener and everything works as it should but every morning we find the door open. Then in the afternoon it usually closes itself.

I tried disconnecting the manual push button on the wall and took the batteries out of the one remote to narrow it down and still have the problem

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Try erasing and reprogramming new codes..

Posted on May 03, 2015

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I would look for a shorted out wire to the wall button. maybe a staple thru the wires shorting it out. cold night and warm days expand/contract wires and staples and make a connection.

Posted on May 01, 2015

Testimonial: "We had already disconnected the bell wire ( at the motor )for the push button and it did not help. Thank You."

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Craftsman 3/4 hp Chain opener.....Door opens and closes by itself. No blinking light, looks like everything is clear with sensors. Half opens then closes, then door completely closes and 5 seconds later...


You most likely have a bad wall control or the wiring to it. An easy way to check this is to remove the connection at terminal #1 on the rear of the motor unit. Just remember that your wall control will not work with this wire off. Your remotes will still work though.

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Something in the receiver portion of the logic board has become sensitive to cold. This is not uncommon in electronics. The sensors are working as they should and the wall control is hardwired and doesn't use the receiver. A new logic board is the repair. The lights are normally a simple repair. Unplug the unit and pull out on the center contact of the light sockets.

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Remote only closes the garage door, will not open it


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.

In your case the expansion of the wall in the afternoon may be enough to cause pressure on the wire to increase the problem – works in the morning but not the afternoon.

Also after you change the batteries you need to reprogram the remotes.

HOPE THIS HELPS

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