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Unfortunately the icemaker has just failed. There isn't anything you can do to get it to reset, these icemaker don't disassembly so you can't get inside the head to slip the arm gear or something like that. The icemaker would just need to be replaced so below is a link to the icemaker you'd need to order in the link below.
CLICK HERE for icemaker
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Not to dumb it down too much, but everything just stops eventually. In general, Samsung icemakers are probably the most problematic icemakers in the entire industry. They tend to fail often and usually with no warning. They fail in many different ways whether the arm gets stuck in the up position, or the tray gets stuck in an 45 degree angle, or a sensor fails or whatnot---they just fail often.