Product review (5 stars): Solved the water/ice spilling out on the floor when not in use - GE Monogram side-by-side Model #ZISS480DRCS
I used this part in a GE Monogram side-by-side cabinet depth refrigerator - model # ZISS480DRCS (stainless steel).  The problem that this part fixed was the dispenser was not stopping and the refrigerator was spilling water or ice (based on what was selected) out of the refrigerator when not in use. The way we controlled this until the part was installed was to put the lock on the panel in the "on" position.

The hardest part about installing the part was figuring out how to access the panel. On this model you need to fully remove the outer stainless steel skin of the refrigerator because all the parts are behind the skin.  To do this take out the 6 screws along the inside of the refrigerator door and the 4 screws located on the top and bottom of the door.  Once those are removed push the stainless steel skin towards the hinge of the door, and with the door slightly open use your fingers to gently pull the edge of the skin away from the door.  I also gently pried the skin at the top of the door near the hinge to get it started.  It takes some strength and persistence, but the skin will come off at the hinge, and then the whole skin will come loose (you do not need to remove the door handle - it comes off with the skin).  Once you get the skin removed, you will need to remove the black rectangular bracket found on the outside of the freezer.  Gently prior from one of the corners and the bracket will come lose.  Now you will be able to have access and remove the control panel.  To remove the control panel pull this from the bottom. The top is secured under a plastic part to hold it in.  Again, this did not come out easy.  Pull with some force gently and once the bottom comes loose, you can tilt it out and the top will come out under the bracket holding it in on top.  From here you can follow the directions you'll find online related to this part on many YouTube sites.

Sorry I don't have pictures, hopefully my descriptions of the job will help.  It isn't a hard job, but I was unable to find any YouTube videos to help me with my refrigerator model.  This is what worked for me.  Good luck!