norcold ice maker

Ice makes initiate their harvest cycle when the mold cools to about 15 degrees. After that every is "timed". A timer motor turns the wiper to push out the formed ice cube. It runs till it stalls against the cube in the mold and hangs there until the mold heater warms up and the ice is released from mold. It pushes out the ice cubes and opens the water feed solenoid for a few seconds to allow fresh water into the mold and then the timer motor reaches the end of it's rotation, it stops and waits for the mold to cool down again so another harvest cycle can begin. The mold heater is controlled by the timer motor and a high temperature limit snap disk. That's pretty much to whole story on ice makers. If you understand how they work, troubleshooting them is a lot easier.

If your mold isn't filling with water, the feed line is either plugged up or the solenoid isn't opening to allow water through it. Stay focused on that until you find the problem.