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Error code reference

LG Refrigerator Error Code Er rS (sensor 2)

Refrigerator sensor 2 failure

LG codesLG refrigerator codes

Refrigerator sensor 2 failure - snapping or short-circuit of refrigerator sensor 2.

First step from the service manual

Check resistance of refrigerator sensor with a digital tester after separating CON8 of the PWB ASSEMBLY.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What Er rS (sensor 2) means on a LG refrigerator

The Er rS error code on an LG refrigerator indicates a failure in refrigerator sensor 2, one of the temperature sensing elements used by the main control board to monitor internal compartment conditions. This fault is triggered when the control board detects either an open circuit (snapped or broken sensor wire) or a short circuit in the sensor 2 circuit. Without reliable temperature data from this sensor, the refrigerator cannot properly regulate its cooling cycle, which can result in temperature inconsistencies or continuous compressor operation.

The sensor connects to the main PWB (printed wiring board) assembly through connector CON8. Diagnosis begins by separating CON8 from the PWB and measuring the sensor's resistance with a digital multimeter. A properly functioning NTC thermistor sensor will show a predictable resistance value that changes with temperature. A reading of zero ohms indicates a short circuit, while an infinite or open resistance reading confirms a broken or snapped sensor wire. Either condition will trigger the Er rS fault code.

Common causes of this failure include physical damage to the sensor wiring harness from ice buildup or frost events, corrosion at the CON8 connector pins, or degradation of the thermistor element itself over time. In some cases, the wiring between the sensor and the connector may be pinched or chafed during a prior service, creating an intermittent or permanent short. Addressing this code promptly is important because the refrigerator may not maintain safe food storage temperatures while the fault is active.

Source: manufacturer service documentation.

Common causes of Er rS (sensor 2)

  1. 01

    Failed or degraded thermistor sensor

    Part replacement

    The sensor 2 thermistor element itself may have burned out or degraded, producing an out-of-range resistance reading. This is the most frequent cause and is confirmed by measuring resistance at CON8 after disconnecting it from the PWB.

  2. 02

    Broken or snapped sensor wiring

    Part replacement

    The wire connecting sensor 2 to CON8 on the PWB can snap due to stress from frost accumulation, ice buildup, or repeated thermal expansion and contraction. This creates an open circuit that the control board reads as a sensor failure.

  3. 03

    Short circuit in the sensor circuit

    Part replacement

    A short circuit can occur if the sensor wiring insulation is damaged by chafing, pinching, or moisture ingress, causing two conductors to contact each other. A digital tester at CON8 will show near-zero resistance in this condition.

  4. 04

    Corroded or loose CON8 connector

    Wiring / connection

    The CON8 connector pins on the PWB assembly can become corroded or lose proper contact over time, simulating a sensor fault even if the sensor itself is intact. Inspect the connector for discoloration, oxidation, or loose pin seating before replacing the sensor.

  5. 05

    Faulty PWB assembly

    Part replacement

    If the sensor and all wiring check out within normal resistance ranges at CON8, the PWB assembly itself may have a defect preventing it from correctly reading the sensor signal. This is the least common cause and should only be considered after sensor and wiring checks are completed.

See the test procedure for each cause

Frequently asked questions about Er rS (sensor 2)

What does Er rS (sensor 2) mean on a LG refrigerator?
Er rS indicates that the refrigerator's sensor 2, a temperature-sensing thermistor, has either an open circuit (broken wire) or a short circuit. The control board monitors this sensor to regulate cooling and displays this code when the signal falls outside acceptable parameters. The refrigerator may not cool properly while this error is active.
Can I fix the Er rS error code myself?
A knowledgeable DIYer can perform the first diagnostic step by disconnecting CON8 from the PWB assembly and measuring the sensor resistance with a digital multimeter. If the sensor reads open or shorted, replacing the sensor is a straightforward repair. However, if the wiring or PWB assembly is involved, professional service may be needed.
Is it safe to keep using my LG refrigerator while Er rS is displayed?
It is not recommended to rely on the refrigerator for food storage while this error is active. Because sensor 2 is used to monitor compartment temperature, the cooling system may not function correctly, and food could be held at unsafe temperatures. Perishable items should be moved to another refrigerator until the fault is resolved.
Will resetting my LG refrigerator clear the Er rS error?
A power reset may temporarily clear the error code, but if the underlying sensor failure is still present, the code will return once the control board re-checks the sensor circuit. A permanent fix requires diagnosing and repairing or replacing the faulty sensor, wiring, or connector at CON8.
How much does it cost to repair the Er rS error on a LG refrigerator?
If only the temperature sensor needs replacement, parts typically cost in the range of $15 to $50, and the repair is relatively inexpensive if done without professional labor. If the PWB assembly requires replacement, parts alone can range from $100 to $300 or more, with additional labor costs if a technician is needed. Getting a diagnostic assessment first helps avoid unnecessary parts replacement.

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