TB-14SN-B General Electric Refrigerator - Overview

Hi Brian, thank you for reaching out. In a refrigerator, the temperature of cooling coils is typically below the freezing point of water. If the cool air of the compartment meets hot or humid air out of the compartment, the water vapour condenses and settles on the cooling coils. In time, it build-ups a thin layer of frost on the cooling coil. To avoid this, your refrigerator comes with a defrost heater, part number PS303817, which turns on several times throughout the day to melt away any frost that may have accumulated on the coils. If the defrost heater does not turn on, frost will continue to accumulate on the coils, which will eventually frost over, and you may need to replace this part. Let us know if you have further questions!