Many top-freezer ice makers have very similar ice makers that are pretty easy to diagnose. Side by side refrigerators have a variety of ice makers so I’ll start with the more common top freezer units. If yours makes crescent shaped ice cubes this will probably be relevant to your unit.
These ice makers have a metal wire bail or wand that senses if the ice level is too high. This sensor stops the ice maker from making ice that would overflow the catch bin. Check to make sure this sensor isn’t obstructed or locked at the far end of its travel. In normal operation the sensor wand should be resting against the ice maker. As it begins a cycle the wand sweeps across the catch bin and will be stopped if ice has risen too high. The same wand can be locked in a position at the far end of its travel to disable the ice maker. This is the most common cause of no ice. This may be what you meant by "made sure the tray was set right and arm was done"
If you have a different type of ice maker just spend a few minutes watching it operate or examine the non-operating unit. If you have a neighbor with a similar unit take a look at theirs. Many have a front cover that easily pops off giving access to the internal works. Listen as you watch to hear solenoid valves open, water flow, etc.
Make sure you look for any other interlock switches that would stop ice making if the tray were removed, the door was opened, etc.
You’ve already checked the water line, I’ll assume you disconnected it and tested for water flow or it was a translucent line and that you saw water in it. While you could do further tests on the water inlet valve, it’s probably easier just to verify that water is making it into the ice mold. If no water or ice is in the mold then you need to check the inlet valve or check the timer’s water switch. If there’s water or ice in the mold then your water supply is working and we need to look elsewhere. If there’s ice in the mold the most likely cause is the heater or ejector. If there's water it could be several things from the freezer temperature to the heater switch.
It's easier to figure out the problem if you have a simplified idea of how the ice making process works. An electromechanical timer controls the sequence of events for the entire process and acitivates valves and switches at the proper stage of the process. An ice mold receives water through an inlet valve. The mold is usually cooled just by the freezer air and relies on it's mass to retain the cold. Once the water has been in the mold for the correct time the cubes are given a brief shot of heat from a heating element in the mold. This loosens things up so a mechanical ejector can push the cubes from the mold. More water is added and the process continues.
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