Manual defrost freezer models accumulate frost and requires it to be manually defrosted. To manually defrost your product, disconnect the unit from power for the frost to thaw and melt. DO NOT use a sharp object to remove the frost as this may cause damage to yourself or the product. Once the frost is melted remove all water using a towel and sure the product is dry. Once dry, reconnect the unit to power and allow at least 3 hours to reach temperature setting. If you have any further questions or are experiencing difficulties please be with your product and contact Hisense Customer Support on 800 447 367. Hours of operation are Monday to Friday 8:30am to 7:30pm AEST and weekends from 9am to 5pm AEST.