Hello every one: I finally decided to call sub-zero refrigeration they diagnosed the problem within the first 5 seconds of thier visit. It was a fualty thermostat ($290.00) Problem was resoved. Thank you
You are probably getting an ice build up on the evaporator and the drain also blocked with ice. take back cover off freezer and melt any ice off with careful use of a hairdryer. make sure the drain at the bottom of evaporator if free by pouring a little water down it. if blocked with ice, free with hot water and parience. if fault reoccurs, you have a fault on defrost system
Usually answered in minutes!