Product review (5 stars): Easy to replace (once you find out where!!)
Own a 44" KitchenAid side by side built in unit.
Finding the location of this part was a challenge.
It's located ON TOP of the unit, seen only after you roll out this behemoth.
Easy to replace! Just follow these steps.....
Turn off water cold water "T", unplug the fridge @ wall.
Unscrew the two screws that hold the valve to the fridge frame.
Place towel under valve,
Disconnect 2 electrical plugs (remember and/or mark with a sharpie which goes to which side).
Use wrench to loosen the (water in)copper compression nut.
Use fingers to loosen the 2 plastic (water out) nuts.
Reverse the steps with the new valve.
This should take care of MOST problems!

In my case, I DID NOT get ice within 6 hours...(
I did get ice if I added 6 ounces of water to the ice bin and waited.. so I determined that the ice maker parts were ok).
I removed the Ice Maker unit itself (3 screws in the freezer).
I noticed that the water supply tube was "frozen over"
Using a hair drier and/or shooting hot water with a turkey baster/syringe, I was able to clear the ice to a point 4 inches up the tube.
Reset the Ice maker (3 screws)... waited 6 hours...
NOW...LOTS OF ICE!

This confirms my internet research...that the most common reason for no ice is either a broken valve, and/or a clog in the water line (ice...filter...kink...etc..)
Good Luck!