This topic at the repair forum has some excellent instructions from Sublime Masters of Appliantology on how to diagnose the infernal optics control boards on these over-engineered icemakers that use the optical ice level sensing… as if that’s appropriate technology to have in a silly little icemaker inside your freezer.
What are the manufacturers thinking when they put out this overblown garbage? It’s as though they had a bunch of electrical engineers sitting around one day and said, “Oh, I know! Let’s design an icemaker that uses a bunch of flimsy, expensive electronics to replace a function that could be done more reliably and less expensively by a simple mechanical feeler arm!” Brilliant. 
To learn more about your ice maker, or to order parts, click here.
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