As an expert technician, I have diagnosed the LG refrigerator with error code E r2 (often displayed as Er r2). This specific error indicates a malfunction within the Refrigerator Temperature Sensor (also known as the Fresh Food Thermistor) circuit. The Main Control Board has detected an open circuit, a short circuit, or a voltage reading that is outside of the acceptable operating range for the fresh food compartment.
LG refrigerator with error code E r2: Troubleshooting Instructions
- Power Reset: Unplug the refrigerator or trip the circuit breaker for 60 seconds. Restore power to see if the code clears. If the code returns immediately, proceed to hardware testing.
- Locate the Sensor: The Refrigerator Sensor is typically located inside the fresh food compartment, housed behind a small, louvered plastic cover on the side wall or the ceiling.
- Inspect Wiring: Remove the sensor cover and inspect the wire leads. Look for signs of moisture intrusion, corrosion on the connector pins, or broken wires.
- Resistance Test (Ohm Test): Use a multimeter set to the “Ohms” (Ω) setting. Disconnect the sensor from the wire harness and measure the resistance across the two sensor leads.
- Check Control Board Connection: If the sensor tests fine, check the connection at the Main Control Board (located in a panel on the back or top of the refrigerator). Ensure the
CON6orCON7(depending on the model) connector is seated firmly.
Expected Ohmic/Resistance Values
The Refrigerator Sensor is an NTC (Negative Temperature Coefficient) thermistor. Its resistance changes based on the temperature it detects:
- At 77°F (25°C): The resistance should be approximately 10k Ω.
- At 32°F (0°C): The resistance should be approximately 30k Ω to 32k Ω.
- Failure State: If the multimeter reads
0 Ω(short circuit) orOL/1(open circuit), the Refrigerator Sensor is defective and must be replaced.
Estimated Repair Cost
- Replacement Part: $20 – $55 USD (for the Thermistor Assembly).
- Professional Labor: $150 – $250 USD (if a technician is hired).
Safety Warnings
Warning: Always disconnect the refrigerator from the power source before removing any covers or touching electrical components. Failure to do so can result in a fatal electrical shock. Use a multimeter with insulated probes when testing live circuits if necessary, though resistance testing should always be done with the power OFF.
Repair Difficulty
Difficulty: DIY (Moderate)
This repair is manageable for most homeowners with a basic multimeter. The most difficult part is often removing the plastic clips of the sensor cover without breaking them. If the sensor tests within the correct Ω range, the issue may lie in the Main Control Board, which is a more expensive and complex replacement.
I am a master Appliance Repair technician with over 35 years of experience in the field. I am passionate about helping people troubleshoot their appliances and fix common problems. My website, appliancemode.com, provides a wealth of information on troubleshooting common appliance issues and deciphering error codes. This website aims to empower people to tackle appliance repairs themselves and save money on service calls.
