Excessive frost buildup on the interior walls, shelves, and food packages.

Safety: Unplug the freezer before performing a full manual defrost.

• 1. Perform manual defrost: Remove food to a cool box, unplug the freezer, and leave the door open. Place towels to catch meltwater. Do not use sharp tools to remove ice.
• 2. Inspect door gasket: After defrosting, check the gasket for gaps or damage. Replace if necessary.
• 3. Check door usage: Reduce the frequency and duration of door openings. Ensure the door is fully closed each time.
• 4. Verify door switch: Ensure the door switch turns off the fan and light when closed. Replace if faulty.
• 5. Clear drain (no-frost models): Locate the defrost drain at the bottom of the evaporator area and ensure it is not blocked with ice or debris.

Note: Persistent heavy frost after these steps may indicate a defrost system fault that requires further diagnosis.