Product review (5 stars): Cube Selector Size Button - Extra Purpose
I agree with the positive reviews posted for this item. My order came with no instructions. Taking off the existing unit, only 2 mounting screws involved, plus the wiring harness connector and ground wire screw.  I reversed the procedure for the new icemaker. Once installed, it was not doing anything even though the power light was on. I thought it was defective but searched online and found this quick and poor quality video which had the key to my problem which was to hold the cube selector size button for 8-10 seconds to get it to cycle the first time ( see https://youtu.be/U2MI2H0HmQs ). I am now getting plenty of ice and the unit is silent in its operation.