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Good morning. My name is ***** ***** I'll be assisting you with your refrigerator today. First, the noise you hear is the fan hitting the ice build up behind the back panel inside the freezer. Your unit isn't defrosting properly for some reason. You'll need to remove the back panel inside the freezer and thaw all the ice out. If you use a multimeter you can test continuity through the defrost heater that runs along the bottom of the silver coils as well as the defrost thermostat clipped onto the top of the silver coils. If either part has no continuity, then you need to replace it. If they both have continuity, the display board will need to be replaced because that is what controls the defrost cycle on your refrigerator.
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Hello again. I'm just following up because I haven't heard back from you and I see this question is still open and unrated. Is there anything else I can help you with?