Display shows H1 or HI and the freezer interior is too warm; high temperature alarm may sound.

Safety: No internal electrical work is required for basic checks, but unplug the unit before removing panels.

Immediate actions:

• Verify door closure: Ensure the door is fully closed and not blocked by food items. Listen for the latch engaging.
• Check gasket: Inspect the door gasket for tears, gaps, or debris. Clean with warm soapy water and dry. Replace if damaged or not sealing.
• Allow recovery time: If the door was left open, close it and allow 12–24 hours for the temperature to return to normal. Avoid frequent door openings.
• Check loading: Do not overpack against the rear wall or air vents; maintain airflow.
• Sensor and cooling checks: If H1 persists with a closed door, test the cabinet thermistor and verify the compressor and fans are running. Replace a faulty thermistor or contact a technician if the sealed system is not cooling.

Food safety: Discard perishable items that have been above 0°F (-18°C) for extended periods.