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Hello, Thank you for your question. A light frost or ice buildup on the back wall can occur when moisture enters the refrigerator, especially if the door is opened frequently or is not sealing completely. Make sure the door closes fully, the door gasket is clean and sealing properly. If ice continues to accumulate regardless of the temperature setting, please contact us at 1-877-467-4289 or insignia@bestbuy.com for further assistance. Sidhartha | Insignia
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