LG Refrigerator Error Code R-SENSOR ERROR

R-SENSOR ERROR indicates a fault in the refrigerator compartment temperature sensor circuit. The main PCB has detected that the sensor signal is outside the valid range, which can result from a loose sensor, a wiring issue such as a cut or short, a bad connector contact, or a failed thermistor. The valid sensor operating range is between -122°F (-50°C) and 122°F (50°C). When the signal falls outside this range, the board logs the error and cooling performance may be affected.

A reset may temporarily clear the error display, but the code will return if the underlying fault has not been corrected. The error is triggered by a hardware condition, specifically a sensor signal that is out of range or absent entirely. Addressing the root cause, whether it is a loose sensor, damaged wiring, or a failed thermistor, is required to permanently resolve the fault.

Repair costs vary depending on the specific cause. If the fix is simply reseating the sensor or reconnecting a loose connector, there may be little to no parts cost, with only a service call fee if a technician is involved, typically ranging from $75 to $150. Replacing the thermistor sensor itself usually involves parts costs in the range of $20 to $60, plus labor if professionally serviced. Wiring harness repairs or main PCB replacement, if the board is damaged, can push total costs higher, generally between $150 and $400 or more depending on the extent of the repair.

Start by checking the voltage at main PCB connector CN30, pins 6 and 7. The reading should be between 1.0V and 4.5V under normal conditions. If the voltage is at 0V, check for a short or severed wire; if it is pinned near 5V with no change, look for an open circuit or disconnected sensor. Also confirm the sensor housing is fully seated in its bracket and that the connector is free of corrosion or damaged pins. If the wiring and connections are intact but the voltage is still wrong, the thermistor itself likely needs to be replaced.

Using the refrigerator while this error is active carries a risk of inadequate cooling because the control board cannot accurately regulate compartment temperature without a valid sensor signal. Food safety may be compromised if the compartment temperature rises above safe levels without triggering a proper response from the cooling system. It is recommended to check and repair the fault promptly rather than continuing to run the unit in this condition.