Wine cooler shows E3 and interior light or fan may behave erratically; temperature control may be locked or unresponsive.

Safety: Unplug the appliance before removing any control panel or trim pieces. Avoid static discharge when handling the control board.

How to troubleshoot:

• 1. Locate ambient sensor: On many LG wine coolers, the ambient sensor is near the front grille or air intake, sometimes behind the kick plate or control panel.
• 2. Visual inspection: Remove the kick plate or front trim. Look for a small sensor probe or plastic-encased thermistor. Check that it is not broken, crushed, or hanging loose.
• 3. Check wiring: Follow the sensor wires to the main control board. Ensure connectors are fully seated and free of corrosion.
• 4. Measure resistance: With the unit unplugged, disconnect the sensor and measure resistance at room temperature. Compare to LG's NTC chart if available. Replace if reading is open, shorted, or clearly abnormal.
• 5. Reinstall and test: After replacing the sensor, restore power and clear the error by unplugging for 5 minutes. Verify that E3 does not return and that temperature controls respond normally.
• 6. Control board check: If a known-good sensor still results in E3, the main PCB may have a failed sensor input circuit. Replacement of the board is required.

Note: Do not relocate the ambient sensor; its position is calibrated for accurate temperature control.