My Craftsman garage door opener 139.53985D open garage by itself and randomly. What to do ?

B B Garage door EXPERT August 19, 2009

This unit protects against this unless some one actually has a remote that has been coded into the machine, or sometimes people put a remote some where that it press on it in a drawer or something. Check for this first. So lets make sure no one has this ability.

There is a purple learn button on the motor unit that can be pushed. Press and hold this until the led light by it goes out.

Then press it again briefly and then press the button on the remote. The light bulb will flash once to let you know it is set. Do this paragraph for all remotes.

To set the keypad press the learn button and then press the 4 digit code followed by the up/down button. Again the light bulb will flash. Wait 2 minutes and try everything.

If it still has the problem then you have a problem with your logic board and it needs replaced. This is the only two things it can be.