Display shows H1 or a flashing high temperature icon; interior is warm and alarm sounds after a power outage or door left open.

Safety first: No internal electrical work is required for this alarm, but always unplug the unit before removing panels.

Step-by-step checks:

• 1. Confirm cause: If the door was left open or a large quantity of unfrozen food was added, the alarm is likely normal. Close the door and allow 12–24 hours for temperature to recover.
• 2. Check door seal: Inspect the door gasket for tears, warping, or debris. Clean the gasket and cabinet mating surface with warm soapy water and dry thoroughly.
• 3. Verify door alignment: Ensure the door hinges are tight and the door closes evenly. Adjust hinges if the door sags.
• 4. Clear alarm: Many Gram freezers allow you to silence the alarm by pressing the alarm or reset button. The code/icon will clear automatically once temperature returns to normal.
• 5. Monitor temperature: Use a separate freezer thermometer to confirm that the interior reaches and maintains the correct temperature.

When to call a technician: If the alarm persists despite a properly closed door and no recent warm load, there may be a cooling or sensor issue that requires professional diagnosis.