A sudden and aggressive accumulation of frost or ice sheets inside a freezer is usually caused by excessive moisture entering the cabinet or a failure in the automatic defrost system. Common culprits include a door left slightly ajar, worn or torn rubber door gaskets letting warm humid air leak inward, or a blocked defrost drain overflowing with ice. Mechanically, if components like the defrost heater, defrost thermostat, or defrost timer fail, ice will blanket the internal evaporator coils. Always inspect door seals and check for proper closure. You can verify this step was successful by manually melting the frost, inspecting door seals, and confirming the automatic defrost cycle engages properly over 24 hours.
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