I have the same issue, I have defrosted monthly, replaced the ice machine, have had techs out multiple times! The fan makes noise, do not buy Samsung fridges.
Recommend putting silicone cone around the ice machine inside and out to seal it better. This worked for awhile but after 6 months it started again, at least I had 6 months without a noisy fan.
Try pulling the fridge out further from the wall as well.
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