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Error code reference

LG Refrigerator Error Code Outer sensor short

Ambient (outer) temperature sensor short circuit fault

LG codesLG refrigerator codes

Ambient (outer) temperature sensor short circuit fault - sensor reading suspected to be over +50°C.

First step from the service manual

Check outer sensor resistance and wiring; replace sensor if faulty.

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

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What Outer sensor short means on a LG refrigerator

The outer sensor short error on an LG refrigerator indicates a short circuit fault in the ambient temperature sensor, also called the outer sensor. This sensor is responsible for monitoring the air temperature surrounding the refrigerator, which the control board uses to adjust cooling operation and compressor cycles. When the control board detects a sensor reading that exceeds +50°C, it flags the circuit as a short fault. A genuine ambient temperature reading that high is physically implausible in normal operating environments, so the reading is understood to reflect an electrical fault in the sensor or its wiring rather than actual room temperature.

The ambient sensor is a negative temperature coefficient (NTC) thermistor, meaning its resistance decreases as temperature rises. A short circuit in this sensor or its wiring harness forces resistance toward zero ohms, which the control board interprets as an extremely high temperature reading, triggering the fault code. This is the opposite of an open circuit fault, where resistance spikes to infinity and the board reads an implausibly low temperature.

Diagnosing this fault starts with disconnecting the sensor connector and measuring the sensor's resistance with a multimeter. A shorted sensor will read near zero ohms instead of the expected resistance value for ambient conditions. The wiring harness between the sensor and the control board should also be inspected for pinched, melted, or chafed wires that could create a short to ground. If the harness checks out, replacing the outer sensor is the most common resolution.

Source: manufacturer service documentation.

Common causes of Outer sensor short

  1. 01

    Failed outer temperature sensor

    Part replacement

    The NTC thermistor sensor itself has shorted internally, dropping its resistance to near zero ohms. This is the most common cause and is confirmed by measuring the sensor resistance directly at the sensor connector.

  2. 02

    Shorted or damaged wiring harness

    Wiring / connection

    The wires connecting the outer sensor to the control board may be pinched, melted, or chafed, causing a short to ground. Inspect the full length of the harness for visible damage, especially near routing clips or sharp edges.

  3. 03

    Connector corrosion or damage

    Wiring / connection

    Moisture or physical damage at the sensor connector can bridge the terminals and create a short circuit. Check the connector for bent pins, corrosion, or moisture intrusion and clean or replace as needed.

  4. 04

    Faulty main control board

    Part replacement

    If the sensor and harness both test correctly, the control board's sensor input circuit may have failed internally. This is less common but possible, and replacing the board would be the final step after ruling out all other causes.

See the test procedure for each cause

Frequently asked questions about Outer sensor short

What does Outer sensor short mean on a LG refrigerator?
This error means the ambient temperature sensor, which monitors the air temperature around the refrigerator, has developed a short circuit fault. The control board is receiving a reading interpreted as exceeding +50°C, which indicates an electrical fault rather than actual room temperature. The sensor, its wiring, or the connector are the most likely points of failure.
Can I fix the outer sensor short error myself?
A knowledgeable DIYer can diagnose and fix this error by testing the sensor resistance with a multimeter and visually inspecting the wiring harness and connector. If the sensor reads near zero ohms, replacing it is a straightforward repair. If the harness is damaged, repairing or replacing the affected wires is also manageable without specialized tools.
Is it safe to keep using my LG refrigerator when this error is displayed?
A faulty ambient sensor can affect how the control board manages compressor cycles and cooling output, which may reduce the refrigerator's ability to maintain safe food storage temperatures. It is best to address the error promptly rather than continuing to run the unit with a known sensor fault.
How much does it cost to fix an outer sensor short error on an LG refrigerator?
If only the outer temperature sensor needs replacement, parts typically range from $10 to $40 depending on the model. If a professional technician is needed for diagnosis and repair, total costs including labor generally fall in the range of $100 to $250. Control board replacement, if required, can push costs higher.
Will resetting my LG refrigerator clear the outer sensor short error?
A power reset may temporarily clear the error code from the display, but the fault will return as soon as the control board reads the shorted sensor again. The underlying cause, whether a failed sensor, damaged wiring, or bad connector, must be repaired before the error will stay cleared.

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