If your LCN 1461 has a hold open that holds open automatically, it is probably a 1461-HW/PA (hold open with parallel arm bracket) that has the 1460-3049 hold open arm. This arm has a large adjustment nut on the shoe. This is not the small nut toward the middle of the forearm that attaches the forearm. Turn the hold open adjustment nut slightly counterclockwise and your problem should disappear.
If you have a 1461T track closer the hold open is a clip in the track that captures the roller on the arm. The clip can be removed and the closer will no longer hold open.
If your door closer does not have a hold open arm it may be that the arm is binding when the door is fully open because of an installation error or other minor malfunction. Download the LCN 1460 installation instructions to see if the closer is mounted in the right place on the door to properly allow for 180 degree opening. Check the top of the door for rub marks. The arm should have no contact with the top of the door.