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Error code reference

LG Refrigerator Error Code LS

Lower compartment (K3) sensor is disconnected or shorted.

LG codesLG refrigerator codes

Lower compartment (K3) sensor is disconnected or shorted.

First step from the service manual

Check wiring of respective relevant sensor.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What LS means on a LG refrigerator

The LS error code on an LG refrigerator indicates a fault with the lower compartment temperature sensor, designated K3 in LG's sensor nomenclature. This sensor is a thermistor, meaning it changes its electrical resistance in response to temperature changes. The control board continuously monitors the resistance signal from this sensor to regulate cooling in the lower compartment. When the board detects a reading that falls outside the expected resistance range, either an open circuit (disconnection) or a short circuit, it triggers the LS fault code and may reduce or suspend normal cooling operation in the affected zone.

The two primary failure modes are an open circuit and a short circuit. A disconnected or broken wire, a corroded connector, or a failed sensor element will produce an open circuit, which the board interprets as an infinitely high resistance reading. A short circuit, where two conductors contact each other unintentionally, causes the resistance to drop near zero, which the board reads as an unrealistically low temperature. Both conditions prevent the control board from accurately managing the lower compartment's refrigeration cycle.

Diagnosis should begin with a thorough inspection of the sensor wiring harness and connectors between the K3 sensor and the main control board. Corrosion, pinched wires, loose connector pins, and frost damage are all common contributors to this type of fault. If the wiring checks out, the sensor itself should be tested with a multimeter to confirm it is producing a resistance reading consistent with the compartment's actual temperature. A failed sensor will need replacement to clear the fault permanently.

Source: manufacturer service documentation.

Common causes of LS

  1. 01

    Loose or disconnected wiring connector

    Wiring / connection

    The connector linking the K3 sensor to the wiring harness may have worked loose due to vibration or was not fully seated. Inspect the connector at both the sensor end and the control board end for a secure fit.

  2. 02

    Corroded or damaged connector pins

    Wiring / connection

    Moisture inside the refrigerator compartment can corrode connector pins over time, increasing resistance or breaking the circuit entirely. Look for green or white oxidation on the metal pins and clean or replace the connector as needed.

  3. 03

    Failed K3 thermistor sensor

    Part replacement

    The sensor element itself can fail, producing either no resistance signal or an out-of-range reading. Test the sensor with a multimeter and compare the resistance value to the expected range for the current compartment temperature.

  4. 04

    Pinched or broken wiring harness

    Part replacement

    Wires routed near hinges, panels, or sharp edges can become pinched or abraded over time, causing an open or short circuit. Trace the harness from the sensor to the control board and look for visible damage.

  5. 05

    Frost or ice buildup on sensor

    Wiring / connection

    Excessive ice accumulation around the sensor can sometimes damage the sensor body or its leads and may also indicate a defrost system issue contributing to the fault. Defrost the compartment and re-inspect the sensor and wiring after the ice has cleared.

See the test procedure for each cause

Frequently asked questions about LS

What does LS mean on a LG refrigerator?
The LS code on an LG refrigerator indicates that the lower compartment temperature sensor, identified as K3, is either disconnected or shorted. The control board cannot get a valid resistance reading from the sensor, so it triggers this fault. This can prevent the refrigerator from properly regulating the temperature in the lower compartment.
How do I fix the LS error code on my LG refrigerator?
Start by checking the wiring harness and connector for the K3 lower compartment sensor. Look for loose connections, corroded pins, or damaged wires and repair or reseat them as needed. If the wiring is intact, test the sensor itself with a multimeter to determine whether it needs replacement. In many cases, the fix is as simple as reseating a loose connector.
Is it safe to keep using my LG refrigerator while the LS code is showing?
The LS fault means the refrigerator is not accurately monitoring the lower compartment temperature, so it may not be cooling that section reliably. Food safety could be at risk if the compartment is not maintaining proper temperatures. It is best to resolve the fault promptly and verify the compartment is holding the correct temperature before relying on it for perishables.
How much does it cost to repair an LS error code on an LG refrigerator?
If the fix is simply reseating a connector or cleaning corroded pins, there may be no parts cost involved, though a service call from a technician typically runs in the range of $75 to $150. If the K3 sensor itself needs replacement, parts generally cost in the range of $15 to $50, with total repair costs including labor potentially ranging from $100 to $250. Costs vary based on your location and the specific model.
Will resetting my LG refrigerator clear the LS error code?
A power reset may temporarily clear the LS code from the display, but the fault will return if the underlying wiring or sensor problem has not been corrected. The control board will re-detect the open or short circuit in the K3 sensor circuit as soon as it resumes normal operation. A permanent fix requires inspecting and repairing the wiring or replacing the faulty sensor.

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