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Every freezer is different. Take a moment to read through the owners' manual to figure out exactly how you should go about defrosting your freezer. If you don't have a physical copy of the manual, try visiting the manufacturer's website to locate a digital copy. You will need to make sure your deep freezer is turned off and disconnected from its power source. This will ensure that all of the ice inside the deep freezer melts. You will need to leave the doors of your deep freezer open while it defrosts. This will help the freezer completely defrost more efficiently. The ice in your deep freeze will melt into water and could potentially make a huge mess. Try placing large towels on each of the shelves in the freezer as well as on the floor surrounding the freezer. You can also catch melting water by placing large pans on the freezer shelves. To prevent an unwanted mess, you will want to monitor the progress. Check in every 20 minutes and replace wet towels or empty pans that have filled with water. The size and model of your deep freezer will determine how long it will take for the appliance to defrost. For smaller models, this could take less than an hour. Larger deep freezers may take several hours. Check your freezer manual to see if the manufacturer recommends or cautions against speeding up the defrosting process. Try using a hair dryer, fan, or space heater to speed up the melting process. You could also try using a putty knife to chip around the edges of larger chunks of ice.
Consult the owners' manual. Turn off and unplug the deep freezer. Open the freezer doors. Prepare for a lot of water. Check the progress every 20 minutes. Let the deep freezer defrost until all the ice is melted. Consider speeding up the process.