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Error code reference

LG Refrigerator Error Code Er (rS note2)

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; displayed during LED check only (press freezing and express freezing buttons for more than 1 second).

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
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What Er (rS note2) means on a LG refrigerator

The Er (rS note2) error code on an LG refrigerator indicates a fault with refrigerator sensor 2, specifically a snapping (open circuit) or short-circuit condition in the sensor's wiring or thermistor element. Refrigerator sensor 2 is a temperature-sensing thermistor responsible for monitoring conditions within the fresh food compartment. When the control board detects that the sensor's resistance reading falls outside the expected range, either too high from an open circuit or too low from a short, it logs this error and loses the ability to accurately regulate fresh food compartment temperatures.

This code is displayed exclusively during the LED diagnostic check mode, which is activated by pressing and holding the Freezing and Express Freezing buttons simultaneously for more than 1 second. Because the error does not appear during normal operation display cycles, it is specifically a service-level diagnostic indicator. Technicians should enter this mode deliberately and measure the resistance of refrigerator sensor 2 directly to confirm the fault before replacing any components.

Diagnosing this error requires checking the resistance of the sensor itself. A functioning NTC thermistor sensor will read within a specific resistance range corresponding to the compartment temperature at the time of testing. A reading of zero ohms indicates a short circuit, while an infinite or open resistance reading confirms a broken or snapped sensor element. Wiring harness condition, connector integrity, and the thermistor element itself should all be inspected during this process.

Source: manufacturer service documentation.

Common causes of Er (rS note2)

  1. 01

    Failed or broken thermistor element

    Part replacement

    The thermistor element inside refrigerator sensor 2 can snap or fail internally, producing an open-circuit resistance reading. This is the most direct cause of this error and requires sensor replacement.

  2. 02

    Short circuit in the sensor

    Part replacement

    A short circuit within the sensor or its immediate wiring will cause the resistance to read near zero ohms, triggering the error. Inspect the sensor body for physical damage, moisture intrusion, or pinched wiring.

  3. 03

    Damaged wiring harness or connector

    Wiring / connection

    The wiring between the sensor and the control board can develop breaks, corrosion, or loose connections that mimic a faulty sensor. Inspect the connector pins and harness routing for visible damage before replacing the sensor.

  4. 04

    Corroded or loose sensor connector

    Wiring / connection

    Moisture inside the refrigerator compartment can cause connector terminals to corrode, increasing resistance or breaking continuity. Cleaning and reseating the connector may resolve the error if the sensor itself tests within normal range.

  5. 05

    Control board fault

    Part replacement

    If the sensor and all associated wiring test correctly but the error persists, the control board's sensor input circuit may be faulty. This is the least common cause and should only be considered after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about Er (rS note2)

What does Er (rS note2) mean on a LG refrigerator?
Er (rS note2) means that LG refrigerator sensor 2 has been detected as having an open circuit (snapped) or a short circuit. This sensor monitors temperature in the fresh food compartment. The code only appears during the LED diagnostic check mode, accessed by pressing and holding the Freezing and Express Freezing buttons for more than 1 second. A technician should measure the sensor's resistance to confirm whether the sensor or its wiring is at fault.
How do I fix the Er (rS note2) error on my LG refrigerator?
Start by entering the LED diagnostic mode using the Freezing and Express Freezing buttons held for more than 1 second, then check the resistance of refrigerator sensor 2. Inspect the wiring harness and connector for damage or corrosion. If the sensor reads open or shorted, the thermistor will need to be replaced. If wiring or connectors are damaged, repair or replace those first before condemning the sensor.
Is it safe to keep using my LG refrigerator when Er (rS note2) is showing?
Because this error indicates the control board cannot accurately read the fresh food compartment temperature, the refrigerator may not maintain safe food storage temperatures consistently. It is advisable to check food temperatures with a separate thermometer and limit how long perishables are stored until the sensor fault is repaired.
Will resetting my LG refrigerator clear the Er (rS note2) error?
A power reset may temporarily clear the error from the display, but the underlying sensor fault will remain. If the thermistor is physically broken or shorted, the error will return once the control board performs its next diagnostic cycle. A proper repair requires testing and replacing the faulty sensor or wiring.
How much does it cost to repair the Er (rS note2) error on a LG refrigerator?
Repair costs vary depending on whether the issue is a faulty sensor, damaged wiring, or a control board problem. A replacement refrigerator thermistor sensor typically costs between $15 and $60 for the part. Adding professional labor, the total repair cost generally ranges from $100 to $250, though a control board replacement would increase costs significantly.

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