Hello, my name is Randy and I am here to assist you. Do you happen to have the model number of the unit? Also. look inside your freezer at the back wall and let me know if there is any frost buildup.
Okay, the frost is a good and bad thing. Good because that means the compressor is working correctly. Bad because there shouldn't,t be any frost. You need to take off that aluminum cover off to get access to the coils and see if they are frozen over.
Yes the hair dryer will thaw the coils and get you up and running but only temporarily. You need to replace the defrost control board as your unit is not defrosting like it should be. I am sending you a link to a diagram and the board to be replaced is #4 on the diagram. I am here for further assistance and thank you for your time and patience, Randy.