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Error code reference

LG Refrigerator Error Code Er (rS - sensor 2)

Snapping or short-circuit of refrigerator sensor 2.

LG codesLG refrigerator codes

Snapping or short-circuit of refrigerator sensor 2.

First step from the service manual

Check refrigerator sensor 2 resistance; compressor runs normally, fan at standard RPM.

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 - sensor 2) error code on an LG refrigerator indicates a fault with refrigerator sensor 2, specifically a snapped wire or a short circuit condition in that sensor circuit. This is a temperature sensor (thermistor) that monitors refrigerator compartment conditions and feeds data to the main control board. When the board detects a reading outside the expected resistance range, either an open circuit from a broken wire or a near-zero resistance from a short, it triggers this error to alert the technician.

A key diagnostic clue with this code is that the compressor continues to run normally and the evaporator fan operates at standard RPM. This tells you the sealed system and fan motor are not the source of the problem. The issue is isolated to the sensor circuit itself. To begin diagnosis, measure the resistance of refrigerator sensor 2 directly at the sensor connector. A healthy NTC thermistor will show a resistance value that corresponds to the current ambient temperature of that sensor location. A snapped or open sensor will read infinite resistance (OL), while a shorted sensor will read near 0 ohms.

Common contributing factors include wiring harness damage from ice buildup or mechanical stress, moisture intrusion at the connector causing corrosion and short-circuit conditions, or simple thermistor failure due to age. Inspect the wiring harness leading to sensor 2 for any visible breaks, pinching, or connector corrosion before condemning the sensor itself.

Source: manufacturer service documentation.

Common causes of Er (rS - sensor 2)

  1. 01

    Failed thermistor (sensor 2)

    Part replacement

    The thermistor itself has failed internally, producing either an open circuit or a shorted reading. This is the most common cause and is confirmed by measuring resistance directly at the sensor leads.

  2. 02

    Broken or snapped sensor wire

    Part replacement

    Physical damage to the wiring harness leading to sensor 2 can cause an open circuit. Inspect the full length of the harness for breaks, kinks, or stress points near mounting clips.

  3. 03

    Corroded or loose sensor connector

    Wiring / connection

    Moisture intrusion at the sensor connector can cause corrosion that creates a short circuit or intermittent open circuit. Inspect the connector pins for oxidation, green buildup, or loose fit.

  4. 04

    Ice buildup compressing the wiring

    Wiring / connection

    Excessive frost accumulation in the refrigerator compartment can press against the sensor wiring and cause a short or mechanical break. Check for abnormal ice formations near the sensor location.

  5. 05

    Main control board fault

    Part replacement

    If the sensor and all associated wiring test within normal resistance values, the control board's sensor input circuit may be faulty. This is the least common cause and should only be considered after the sensor and harness are confirmed good.

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?
This code means the main control board has detected a problem with refrigerator sensor 2, either a broken wire causing an open circuit or a short circuit in the sensor or its wiring. The sensor is a thermistor that monitors temperature in the refrigerator compartment. Notably, the compressor and evaporator fan continue operating normally when this code appears, so the issue is limited to the sensor circuit itself.
Can I fix the Er (rS - sensor 2) error on my LG refrigerator myself?
If you are comfortable using a multimeter and working around appliance wiring, you can diagnose this error yourself by testing the resistance of sensor 2 at its connector. If the sensor reads open or shorted, replacing the thermistor is a relatively straightforward repair. However, if the fault is in the wiring harness or the control board, the repair becomes more involved and may benefit from professional service.
Is it safe to keep using my LG refrigerator while the Er (rS - sensor 2) error is displayed?
Because the compressor and fan continue to run with this error, your refrigerator may still be cooling to some degree. However, without a functioning sensor, the control board cannot accurately regulate temperatures, which puts food safety at risk over time. It is best to address the fault promptly and monitor food temperatures closely in the meantime.
How much does it cost to repair the Er (rS - sensor 2) error on an LG refrigerator?
If only the thermistor needs replacement, parts typically range from around $15 to $50 depending on the specific model, and the repair is relatively quick. If a service technician is needed, expect total costs in the range of $100 to $250 including labor. Control board replacement, if required, will cost significantly more, often in the $200 to $500 range for parts and labor combined.
Will resetting my LG refrigerator clear the Er (rS - sensor 2) error code?
A reset may temporarily clear the error code from the display, but the code will return if the underlying sensor fault is still present. The control board will detect the abnormal resistance reading again once it resumes normal monitoring cycles. A permanent resolution requires diagnosing and repairing or replacing the faulty sensor, wiring, or connector.

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