Display shows H1 or HI; internal temperature is too high and alarm may sound

Safety: No internal electrical work is required for basic checks, but unplug the unit if you remove panels.

Immediate actions:

• Check door seal: Ensure the door is fully closing and the gasket is not obstructed by baskets or packaging. Clean the gasket with warm soapy water and dry.
• Allow recovery time: If you recently loaded a large quantity of unfrozen food or had the door open for an extended period, allow 12–24 hours for temperature to stabilize. Avoid frequent door openings.
• Verify cooling: Listen for the compressor and internal fan. You should feel cold air inside after 30–60 minutes of operation.
• Check condenser: Clean dust from the rear or bottom condenser coils and ensure adequate ventilation around the unit.
• Monitor temperature: Use a separate freezer thermometer to verify actual temperature. If it remains high despite continuous running and good airflow, a sealed system issue or compressor failure is possible.

When to call a technician: If the freezer cannot reach proper temperature after 24 hours and basic checks are done, professional diagnosis of the compressor and refrigerant system is required.