Freezer interior is completely frosted over, with thick ice on shelves and walls.

Safety first: Unplug the freezer before defrosting heavy ice buildup.

• Defrost the unit: Remove food to a cooler, unplug the freezer, and allow the ice to melt. Use towels to catch the water. Do not use sharp tools to chip away ice.
• Inspect the gasket: After defrosting, examine the door gasket for cracks, tears, or areas not contacting the cabinet. Warm the gasket with a hair dryer and reshape it if slightly warped.
• Replace the gasket if needed: Remove the inner door liner screws or pull out the gasket retainer, install the new Whirlpool gasket, and ensure it seats evenly.
• Check hinges and leveling: Adjust the hinges so the door is square and closes firmly. Level the cabinet so the door self-closes.
• Change usage habits: Minimize door openings and avoid leaving the door open for extended periods.