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Error code reference

LG Refrigerator Error Code LL

L/Room sensor error detected (open or short circuit in the left room temperature sensor).

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L/Room sensor error detected (open or short circuit in the left room temperature sensor).

First step from the service manual

Check if the connector for the L/Room sensor is inserted properly, then measure resistance at both sensor terminals (should not be 0 ohms or infinity).

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

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What LL means on a LG refrigerator

The LL error code on an LG refrigerator indicates a fault detected in the L/Room (left room) temperature sensor circuit. This sensor is a thermistor, meaning its electrical resistance changes predictably with temperature. The control board continuously monitors the resistance across the sensor terminals to determine compartment temperature. When the board reads a resistance value of 0 ohms (a short circuit) or infinite ohms (an open circuit), it cannot obtain a valid temperature reading and triggers the LL fault code to alert the technician or user.

The left room sensor is typically located inside the refrigerator compartment and is responsible for feeding real-time temperature data to the main control board. If this data is missing or corrupted by a wiring fault, the refrigerator cannot regulate cooling accurately for that zone. This can result in temperature instability, overcooling, or undercooling in the affected section of the refrigerator.

The most common causes of this error include a disconnected or poorly seated wiring harness connector at the sensor, physical damage to the sensor wiring (such as pinching, corrosion, or breakage), a failed thermistor element inside the sensor itself, or in rarer cases, a fault on the main control board that misreads the sensor circuit. The first diagnostic step is to verify the connector is fully seated, then use a multimeter to measure resistance across both sensor terminals. A functional thermistor will show a finite resistance value that is neither 0 ohms nor open line (infinity).

Source: manufacturer service documentation.

Common causes of LL

  1. 01

    Loose or disconnected sensor connector

    Wiring / connection

    The wiring harness connector for the L/Room sensor may have come loose from its socket on the sensor or control board. Reseating the connector fully is the first step and resolves the error in many cases.

  2. 02

    Failed thermistor (open circuit)

    Part replacement

    The thermistor element inside the sensor can fail internally, breaking the circuit and causing the control board to read infinite resistance. A multimeter reading of infinity (OL) across the sensor terminals confirms this failure.

  3. 03

    Shorted thermistor or wiring

    Part replacement

    A short circuit in the sensor or its wiring harness will cause the control board to read 0 ohms. This can result from pinched wiring, moisture intrusion into the connector, or a defective sensor element.

  4. 04

    Damaged wiring harness

    Part replacement

    The wire runs between the sensor and the control board can be pinched by shelving, door components, or during a previous repair. Inspect the full length of the sensor wiring for visible breaks, fraying, or corrosion.

  5. 05

    Main control board fault

    Part replacement

    If the sensor and all wiring test within normal resistance range but the LL code persists, the main control board may be misreading the sensor circuit. This is the least common cause and should only be considered after all wiring and sensor checks pass.

See the test procedure for each cause

Frequently asked questions about LL

What does LL mean on a LG refrigerator?
The LL error code on an LG refrigerator indicates a problem with the L/Room temperature sensor, which monitors the temperature in the left section of the refrigerator compartment. The control board has detected either an open circuit (infinite resistance) or a short circuit (0 ohms) in the sensor circuit, making it impossible to get an accurate temperature reading. This could be caused by a loose connector, a broken wire, or a failed sensor. The issue needs to be diagnosed and repaired to restore proper temperature regulation.
Can I fix the LL error code on my LG refrigerator myself?
A knowledgeable DIYer can attempt the basic diagnostic steps, starting with checking that the L/Room sensor connector is fully seated in its socket. If you have a multimeter, you can measure resistance across the sensor terminals to determine whether the sensor has failed open or shorted. Replacing the thermistor sensor is a straightforward repair if the sensor is confirmed faulty. However, if the wiring harness is damaged or the control board is suspected, professional repair is recommended.
Will resetting my LG refrigerator clear the LL error code?
A power reset may temporarily clear the LL code, but it will return quickly if the underlying fault in the L/Room sensor circuit is still present. The control board checks sensor resistance continuously, so any open or short circuit condition will trigger the code again within a short time. A reset should only be used to confirm whether the fault is intermittent. A permanent fix requires diagnosing and correcting the sensor connector, wiring, or sensor itself.
Is it safe to keep using my LG refrigerator while the LL code is active?
With the LL code active, the refrigerator cannot accurately monitor or regulate the temperature in the left room section of the compartment. This increases the risk of food spoilage due to temperature fluctuations in that zone. It is advisable to minimize use of the affected section and have the fault repaired promptly. If the refrigerator is not cooling at all, do not store perishable food until the issue is resolved.
How much does it cost to repair the LL error code on an LG refrigerator?
If only the L/Room thermistor sensor needs to be replaced, parts and labor typically cost in the range of $100 to $250 depending on your location and service provider. If the wiring harness requires repair or replacement, costs can be somewhat higher. In the rare case that the main control board is at fault, repair costs can range from $200 to $500 or more. Getting a diagnostic visit from a qualified technician first is the best way to get an accurate estimate for your specific situation.

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