Freezer shows E3 and the display temperature is obviously wrong (e.g., shows -18°C while interior is warm).

Safety first: Disconnect the appliance from mains before opening the control panel.

• 1. Locate the control housing: On Severin freezers with digital displays, the ambient sensor is often in or near the front control panel or behind a small grille on the cabinet front.
• 2. Remove control cover: Carefully unclip or unscrew the control panel cover. Avoid damaging the display ribbon cable.
• 3. Identify the ambient sensor: Look for a small probe or plastic-encased sensor connected by two thin wires to the PCB, often positioned near ventilation slots.
• 4. Inspect and reseat: Check the connector for oxidation or looseness. Unplug and replug it several times to clean contacts. Ensure the sensor is not touching hot components.
• 5. Test resistance: Measure the sensor resistance at room temperature. Compare with typical NTC values (e.g., 5–20 kΩ at ~25°C). If readings are open, shorted, or far out of range, replace the sensor.
• 6. Replace sensor if needed: Order a Severin ambient NTC sensor for your model. Swap the old sensor for the new one, routing the cable as originally installed.
• 7. Reassemble and test: Refit the control panel, restore power, and verify that E3 clears and the displayed temperature tracks room changes realistically.

If the sensor tests good but E3 remains, the control PCB likely has a failed input circuit and should be replaced by a professional.