The single most common reason for excessive ice and frost buildup inside a refrigerator freezer is warm, humid air entering the compartment from the outside and condensing on the freezing surfaces. This typically happens when family members leave the freezer door open too long or slightly ajar, or when the magnetic door gasket becomes worn, cracked, or dirty, failing to create an airtight seal. When outside humidity enters the sub-zero interior, moisture immediately turns into frost and solid ice sheets on the coils and walls.
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