LG Refrigerator Error Code R1 sensor

The R1 sensor error indicates that the primary refrigerator compartment temperature sensor is showing an abnormal reading, specifically a short circuit or open circuit condition. The control board cannot get a valid temperature signal from this sensor, which can disrupt normal cooling. The sensor is a thermistor located in the refrigerator compartment, and the fault is detected through its connector at CON7.

With the R1 fault active, the refrigerator may not maintain accurate temperatures in the fresh food compartment, which creates a food safety risk over time. Short-term use while arranging a repair is generally acceptable, but you should monitor the compartment temperature with a separate thermometer and avoid storing perishables if the fridge is not cooling consistently.

A power reset may temporarily clear the error code from the display, but the fault will return if the underlying problem with the sensor or wiring has not been corrected. The control board will detect the abnormal resistance again during its next monitoring cycle and re-trigger the R1 code. A reset is useful for confirming whether a connection issue was resolved, but it is not a substitute for diagnosing and repairing the root cause.

A knowledgeable DIYer can often resolve this error by locating the CON7 connector, checking that it is fully seated, and inspecting the white sensor wires for visible damage. If the connector is secure, you can unplug it and use a multimeter to measure resistance across the white wires to determine whether the thermistor has failed. Replacing a thermistor is a straightforward repair, though working with the refrigerator's internal wiring does require some comfort with basic electrical testing.

If only the thermistor needs replacement, parts typically cost in the range of $15 to $50 depending on the specific model. Professional labor to diagnose and replace the sensor can add $100 to $200 to the total. If the issue is simply a loose connector at CON7, there may be no parts cost at all.