Remove all frozen food items and place them in a cooler to keep them from thawing as you clean the drain.
Unplug the freezer and leave the freezer open to allow excess ice buildup to melt. Wipe up excess liquid with a towel.
Turn on the hair dryer to the highest heat setting and point it at the drain. The drain pipe is located at the back of the freezer and is indicated by a small hole in the floor of the freezer. Hold the dryer 2 inches from the drain, allowing hot air to blow down the hole for five minutes.
Straighten a wire coat hanger and use it to clear the drain. Hold the hanger in your hand and push it down into the drain, moving it up and down to break up ice chunks along the drain. If there is any resistance, remove the wire and heat the pipe with the dryer for another five minutes.
Heat 1 cup of boiling water in a saucepan on the stove, and pour the water down the drain. This will melt any remaining ice buildup inside the drain. Pull the drain pan out from the bottom of the freezer and pour any accumulated water down the sink.
Plug the freezer back in and put the frozen food items back inside once it has returned to a proper temperature.