Display shows E3 and the freezer interior light or control panel backlight may behave erratically.

Safety first: Disconnect mains power before removing the control panel or display housing.

• Locate ambient sensor: On many Logik freezers with digital displays, the ambient sensor is positioned near the control panel or behind a small vent on the front fascia.
• Remove control panel cover: Carefully unclip or unscrew the control panel. Avoid pulling hard on the wiring.
• Inspect sensor and wiring: Look for a small two-wire sensor (often in a plastic sleeve). Check for broken wires, discoloration, or corrosion at the connector. Clean light corrosion with contact cleaner and a soft brush.
• Test sensor resistance: With the sensor unplugged, measure resistance at room temperature (around 20–25°C). Typical NTC values are 5–15 kΩ. An open or short indicates failure.
• Replace ambient sensor: If readings are abnormal, install a new ambient NTC temperature sensor. Route the wires as originally installed and secure them away from sharp edges.
• Reconnect and test: Reassemble the control panel, restore power, and check if E3 clears. Confirm that the display and interior light operate normally.

When to seek service: If the sensor tests good but E3 persists, the display PCB or main control board may be defective and should be evaluated by a professional.