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Error code reference

LG Refrigerator Error Code Error10

Water tank sensor abnormal

LG codesLG refrigerator codes

Water tank sensor abnormal - short circuit or open circuit.

First step from the service manual

Access display check by pressing FREEZER and ICEPLUS buttons simultaneously for more than 1 second to verify sensor status.

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 Error10 means on a LG refrigerator

Error10 on an LG refrigerator indicates an abnormal signal from the water tank sensor, caused by either a short circuit or an open circuit condition in the sensor circuit. The water tank sensor is a thermistor-based component that monitors the temperature of the water stored in the internal tank, which is used to supply chilled water through the dispenser. When the refrigerator's control board reads a resistance value outside the expected range for that thermistor, it flags the circuit as either shorted (resistance too low) or open (resistance too high or no continuity), triggering the Error10 code.

The most common causes of this fault include a damaged sensor, a disconnected or corroded wiring harness connector, or a break in the sensor wiring caused by repeated door movement or improper routing. The thermistor itself can fail internally due to moisture exposure or age, causing it to read out of range even when physically connected. Connector pins that have corroded or backed out of their housing are also a frequent culprit, as they create intermittent or total loss of circuit continuity.

To begin diagnosis, access the display check mode by pressing the FREEZER and ICEPLUS buttons simultaneously for more than one second. This mode allows technicians to review sensor status directly on the display panel, which can help confirm whether the fault is active and consistent or intermittent. From there, inspection of the sensor connector, wiring harness, and the thermistor resistance reading with a multimeter will help isolate whether the sensor itself or the wiring circuit is the root cause of the failure.

Source: manufacturer service documentation.

Common causes of Error10

  1. 01

    Failed water tank thermistor

    Part replacement

    The thermistor sensor itself has failed internally, producing a resistance value that is either too low (short) or too high/infinite (open) for the control board to interpret. This is the most common root cause and requires replacing the sensor.

  2. 02

    Disconnected or loose wiring harness connector

    Wiring / connection

    The connector linking the water tank sensor to the main wiring harness may have come loose, especially near the water tank compartment where components can shift over time. Inspect the connector for proper seating and secure contact.

  3. 03

    Corroded or damaged connector pins

    Wiring / connection

    Moisture in the refrigerator compartment can cause corrosion on the sensor connector pins, increasing resistance or breaking continuity entirely. Look for green or white oxidation on the pins and clean or replace the connector as needed.

  4. 04

    Broken or pinched sensor wiring

    Part replacement

    Wiring routed near door hinges or moving components can develop breaks or shorts from repeated flexing or pinching. Inspect the full length of the sensor wiring harness for visible damage, kinks, or chafing.

  5. 05

    Control board input circuit fault

    Part replacement

    In less common cases, the sensor input circuit on the main control board may be damaged, causing it to misread a correctly functioning sensor. This is typically suspected only after the sensor and wiring have been confirmed good.

See the test procedure for each cause

Frequently asked questions about Error10

What does Error10 mean on a LG refrigerator?
Error10 means the refrigerator has detected an abnormal condition in the water tank sensor circuit, specifically a short circuit or an open circuit. The water tank sensor is a thermistor that monitors the temperature of the internal water supply used by the dispenser. When the control board cannot read a valid signal from this sensor, it displays Error10 to alert you to the fault. The issue can originate from the sensor itself, the wiring, or the connector.
How do I fix Error10 on my LG refrigerator?
Start by entering the display check mode, accessed by pressing the FREEZER and ICEPLUS buttons simultaneously for more than one second, to confirm the sensor status. Next, inspect the water tank sensor connector and wiring harness for any loose, corroded, or damaged connections. If the wiring appears intact, use a multimeter to test the thermistor resistance and compare it against the expected range. If the sensor reads open or shorted, replacing the water tank sensor is the most likely fix.
Is it safe to use my LG refrigerator while Error10 is displayed?
The refrigerator's primary cooling functions will generally continue to operate even with Error10 active, so food safety is not immediately at risk in most cases. However, the water dispenser may not function properly since the water tank sensor is directly involved in that system. It is best to address the fault promptly to avoid potential issues with dispenser operation or further component stress.
Will resetting my LG refrigerator clear Error10?
A power reset may temporarily clear the error code from the display, but it will return if the underlying sensor fault is still present. Error10 is triggered by an active electrical fault in the sensor circuit, meaning the control board will detect the problem again as soon as it checks the sensor. A permanent fix requires diagnosing and correcting the root cause, whether that is a failed sensor, damaged wiring, or a faulty connector.
How much does it cost to repair Error10 on a LG refrigerator?
Repair costs vary depending on the root cause. If only the water tank sensor needs replacement, parts typically range from around 20 to 60 dollars, with additional labor costs if a technician performs the work. If the wiring harness or control board is involved, total repair costs could range from 150 to 400 dollars or more depending on parts and local labor rates. Diagnosing the fault accurately before ordering parts can help avoid unnecessary expenses.

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