Display shows "Hi" or a high temperature warning; the alarm may sound continuously.

Safety first: Ensure the freezer is unplugged before electrical tests; you may plug it in briefly to observe behavior but avoid touching live parts.

• 1. Check door and loading: Make sure the door closes fully and the gasket seals all around. Avoid overloading so that baskets and food do not prevent closure.
• 2. Verify cooling: If the compressor is not running and the interior is warm, check for other error codes (e.g., E5, F3). If the compressor runs but no cooling occurs, suspect a sealed system issue.
• 3. Test cabinet sensor: Unplug the freezer and measure the resistance of the cabinet NTC. An open sensor will cause a "Hi" reading. Replace if open or out of range.
• 4. Inspect wiring: Check the sensor harness for breaks, especially where it passes through the cabinet wall.
• 5. Monitor after repair: After replacing a faulty sensor or fixing door issues, allow 12–24 hours for the freezer to reach set temperature and confirm that "Hi" clears.

If the unit still does not cool despite a good sensor and running compressor, a refrigerant leak or blocked system is likely and must be handled by a licensed technician.