Display shows E3 and the set temperature cannot be maintained; unit may run continuously or shut off prematurely.

Safety: Unplug the wine cooler before removing the front grille or accessing the control board.

How to troubleshoot E3:

• Check installation environment: Ensure the cooler is not installed in direct sunlight or near a heat source. Extremely high ambient temperatures can sometimes trigger sensor-related errors.
• Access the ambient sensor: On many Arctic King wine coolers, the ambient sensor is located behind the lower front grille or near the control panel. Remove the grille or control panel screws to access it.
• Inspect the sensor: Look for a small plastic-encased sensor with two wires. Check for broken wires, corrosion, or a loose connector.
• Test with a multimeter: Disconnect the sensor and measure resistance at room temperature. Compare to typical NTC values (often 5–20 kΩ at 25°C). Replace if reading is out of range or unstable.
• Reconnect or replace: If the connector was loose, reseat it firmly. If the sensor is faulty, install a new Arctic King ambient temperature sensor and route the wiring away from the condenser fan and compressor.
• Power up and verify: Restore power and confirm that the E3 code disappears and the unit responds correctly to ambient changes.

Professional help: If the sensor is good but E3 persists, the main control board may have a defective sensor input circuit.