i had the same problem with my frigidaire and it ended up being a clogged drain tube at the end that dumps out into the tray at the bottom. the back of my icebox was very dirty with lint/dust which somehow got plugged into the bottom of the drain tube; i just pulled up on the tube and it came out if the little holder at the bottom and the cleaned out the clog with the end of a coat hanger.
derek
June 2006