Moisture in the freezer is condensed at the back in a tray that has a drain with a tube that drains to a tray at the bottom of the unit. In our case the drain was clogged and water froze in it. We removed the back panel and pulled out the tube from the drain spout. We then used a hair dryer to defrost the ice clog and a wire to route out the drain and the tube. This worked and we replaced the tube and sealed it with tape. It now drains properly into the tray.