LG Refrigerator Error Code Er dS

Er dS indicates a defrosting sensor error. The control board has detected either a short circuit or a disconnection in the defrosting sensor circuit. The defrosting sensor is a thermistor mounted near the evaporator coil that monitors temperatures during the automatic defrost cycle. The code appears when the sensor's signal is outside the range the board considers a valid temperature reading.

The refrigerator will likely continue to cool in the short term, but the defrost cycle cannot operate reliably without a functioning defrosting sensor. Over time, frost will accumulate on the evaporator coil, restrict airflow, and cause the unit to lose cooling performance. Continued use without repair risks food spoilage and potential compressor strain, so the issue should be addressed promptly rather than ignored.

Unplugging the refrigerator may temporarily clear the display, but the code will return if the underlying sensor fault is still present. Er dS reflects a real electrical condition in the defrosting sensor circuit, not a software glitch. A reset does not repair a failed sensor or a broken wire, so the code should be addressed through the wiring and sensor checks described above.

Start by unplugging the refrigerator, locating the defrosting sensor near the evaporator coil (typically behind the rear panel inside the freezer compartment), and checking whether the wiring harness connector is fully seated. Reconnect any loose connector and restore power to see if the code clears. If the code returns, use a multimeter to test the sensor's resistance and compare it against LG's specified range for the part number in your model. A sensor reading open or shorted requires replacement of the defrosting sensor.

If the fix is simply reseating a disconnected wiring harness, there is no parts cost. A replacement defrosting sensor thermistor for LG refrigerators typically costs between $15 and $40 for the part. If you hire a technician, expect a service call fee plus labor, which commonly brings the total to $100 to $200 depending on your region. The sensor itself is a DIY-accessible repair for anyone comfortable working inside the freezer compartment.