If you can locate the defrost timer and advance it to the defrost cycle you should be able to see the defrost elements glow behind the rear panel in the freezer. Do this before the freezer gets too frosted up. If you can't see the glow then there is a problem with the defrost heaters or the defrost thermostat. Unplug the frig and remove all the racks in the freezer. Remove the screws holding the rear panel on. Locate the two heaters and check the resistance. IF open, replace heaters. IF ok check resistance of the defrost thermostat. IF open when cold, replace defrost thermostat.
If replacing heaters always replace defrost thermostat at the same time. It will save you doing so at a later date
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