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Error code reference

LG Refrigerator Error Code Error3

Refrigerator sensor R2 abnormal (lower part of refrigerator compartment)

LG codesLG refrigerator codes

Refrigerator sensor R2 abnormal (lower part of refrigerator compartment) - 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 Error3 means on a LG refrigerator

Error3 on an LG refrigerator indicates an abnormal signal from the R2 sensor, which monitors temperature in the lower portion of the refrigerator compartment. This sensor is a thermistor, meaning it changes electrical resistance in response to temperature. The control board continuously monitors this resistance value, and when it detects a reading that falls outside the expected range, either due to a short circuit (resistance too low) or an open circuit (resistance too high or no continuity), it triggers Error3 and logs the fault.

The R2 sensor plays a direct role in how the refrigerator manages cooling in the fresh food section. If the sensor is providing inaccurate or no data, the control board cannot properly regulate compressor cycles and fan operation for that zone. This can result in inconsistent temperatures, over-cooling, or insufficient cooling in the lower refrigerator compartment even before the error becomes fully visible to the user.

Diagnosing this fault begins with entering the display check mode by pressing the FREEZER and ICEPLUS buttons simultaneously for more than 1 second. This mode allows a technician to verify whether the sensor is actively reporting an abnormal status. From there, physical inspection of the sensor harness, connector integrity, and thermistor resistance values at the sensor itself will isolate whether the fault is in the wiring, the connector, or the sensor component.

Source: manufacturer service documentation.

Common causes of Error3

  1. 01

    Failed R2 thermistor sensor

    Part replacement

    The thermistor itself may have failed internally, producing either no resistance or a shorted reading. This is the most common root cause and requires measuring the sensor's resistance and comparing it to the expected value for the current temperature.

  2. 02

    Damaged or pinched wiring harness

    Part replacement

    The wiring between the R2 sensor and the control board can become pinched, chafed, or broken, especially near mounting clips or drawer runners. Inspect the full length of the harness for visible damage or breaks in insulation.

  3. 03

    Loose or corroded connector

    Wiring / connection

    The connector joining the R2 sensor harness to the main wiring loom can loosen over time or develop corrosion at the terminals, creating an intermittent or open circuit. Disconnecting and reseating the connector, and inspecting the terminals for oxidation, can confirm this cause.

  4. 04

    Moisture or ice intrusion at sensor location

    Wiring / connection

    Ice buildup or moisture near the lower refrigerator compartment sensor can affect the sensor's resistance readings or physically damage the sensor housing. A thorough defrost cycle followed by re-testing can help rule this out.

  5. 05

    Faulty main control board

    Part replacement

    If the sensor and all associated wiring test within normal parameters, the main control board may be misreading the sensor signal. This is the least likely cause and should only be considered after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about Error3

What does Error3 mean on a LG refrigerator?
Error3 indicates that the R2 temperature sensor, located in the lower part of the refrigerator compartment, has been detected as abnormal by the control board. The fault is caused by either a short circuit or an open circuit condition in the sensor or its wiring. The refrigerator uses this sensor to regulate cooling in the fresh food section, so the error should be addressed to maintain proper temperature control.
Can I fix Error3 on my LG refrigerator myself?
A knowledgeable DIYer can begin by entering the display check mode (press FREEZER and ICEPLUS simultaneously for over 1 second) to confirm the fault, then visually inspect the sensor wiring and connector for obvious damage or looseness. If the wiring looks intact, testing the thermistor resistance with a multimeter is the next step. Replacing the R2 sensor is a straightforward repair if the sensor is confirmed faulty, though tracing wiring faults deeper into the harness may require more experience.
Is it safe to keep using my LG refrigerator while Error3 is active?
Error3 can compromise the refrigerator's ability to accurately maintain temperature in the lower compartment. Food safety may be at risk if the fridge is not cooling correctly as a result of the fault. It is advisable to monitor food temperatures and address the error as soon as possible rather than relying on the refrigerator to operate normally while the sensor fault is active.
How much does it cost to repair Error3 on a LG refrigerator?
If the repair only requires a new R2 thermistor sensor, parts typically range from roughly 15 to 50 dollars depending on the model. A service call with labor can add anywhere from 80 to 200 dollars or more. If the fault turns out to involve the main control board, total repair costs can rise significantly higher. Getting a diagnosis first will help clarify the actual scope of the repair.
Will resetting my LG refrigerator clear Error3?
A power reset may temporarily clear the error code from the display, but if the underlying sensor fault is still present, Error3 will return once the control board re-evaluates the sensor signal. Resetting the unit is not a fix for this error. The root cause, whether a failed sensor, damaged wiring, or a loose connector, must be identified and corrected for the code to stay cleared.

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