Wine cooler displays E1 and interior temperature rises above set point; unit may run continuously or short-cycle.

Safety first: Unplug the wine cooler before removing panels or handling wiring. Use insulated tools and avoid working on a wet floor.

Step-by-step checks:

• 1. Power reset: Unplug the unit for 5 minutes, then plug back in. If E1 clears temporarily and returns, continue with diagnosis.
• 2. Locate the cabinet thermistor: Inside the wine compartment, find the small plastic sensor cover on the rear or side wall. Remove the cover to expose the sensor bulb and wiring.
• 3. Inspect wiring and connector: Check for pinched, cut, or discolored wires leading from the thermistor to the cabinet wall. Gently tug the connector to ensure it is seated. Look for corrosion on pins.
• 4. Test thermistor resistance: With the unit unplugged, disconnect the thermistor from the harness. Measure resistance with a multimeter at room temperature (around 25°C / 77°F). Typical LG NTC thermistors read roughly 5–10 kΩ at room temperature (consult service data if available). If reading is open (OL) or near 0 Ω, the sensor is faulty.
• 5. Check continuity to main PCB: Remove the rear service panel, locate the main control board, and verify continuity from the thermistor connector inside the cabinet to the board connector. Repair any broken or shorted wires.
• 6. Replace the thermistor if defective: Order the correct LG cabinet temperature sensor by model number. Mount the new sensor in the same location, route wiring through the grommet, and reconnect to the harness.
• 7. If sensor and wiring test good: The main control board may be misreading the sensor. Inspect the board for burn marks or swollen capacitors. Replacement of the PCB is typically required if no wiring or sensor fault is found.

When to call a technician: If you are not comfortable testing resistance or accessing the main PCB, or if replacing the thermistor does not clear E1, contact an authorized LG service technician.