Excessive frost build-up on interior walls and food, especially near the top or around the door opening.

Safety first: Unplug the freezer before adjusting hinges or performing a full defrost.

• Inspect gasket: Look for splits, gaps, or areas where the gasket does not contact the cabinet. Warm, moist air entering will cause heavy frost.
• Check door alignment: On upright models, ensure the door is level and square. Adjust the door hinges by loosening the mounting screws and realigning the door, then retighten.
• Reduce overloading: Avoid stacking items so high that they press against the door and prevent full closure.
• Manual defrost: Once the cause is corrected, fully defrost the interior to remove existing frost and restore efficiency.

Persistent frost despite good seals may indicate a faulty defrost system on frost-free models (see E3).