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So this "tC" on the display is not an error code, it means that you pressed turbo cool to cool the refrigerator quicker likely when you noticed the refrigerator or freezer warming up. Either way, the first thing you need to do is pull the refrigerator forward and remove the lower back access panel. Look at the fan next to the big black round compressor and is the fan running? If you touch the compressor is it warm, blazing hot, or room temperature?