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Error code reference

LG Refrigerator Error Code Error2

Refrigerator sensor R1 abnormal (upper part of refrigerator compartment)

LG codesLG refrigerator codes

Refrigerator sensor R1 abnormal (upper part of refrigerator compartment) - short circuit or open circuit.

First step from the service manual

Check resistance at both ends of the R1 sensor at CON9 PIN 5,6.

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

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What Error2 means on a LG refrigerator

Error2 on an LG refrigerator indicates an abnormal signal from the R1 sensor, which monitors temperature in the upper portion of the refrigerator compartment. This sensor is a thermistor, meaning its resistance changes predictably with temperature. The control board reads this resistance to determine the compartment temperature and regulate cooling cycles. When the board detects a resistance value that falls outside the expected range, it flags Error2, indicating either a short circuit (resistance too low) or an open circuit (resistance too high or no continuity).

The diagnostic process begins at CON9, pins 5 and 6, which are the connector points for the R1 sensor on the main control board harness. A technician should disconnect the sensor and measure resistance across these two pins using a multimeter. A healthy NTC thermistor will show a resistance value that corresponds to ambient temperature. A reading near zero ohms suggests a short circuit in the sensor or wiring, while an infinite or very high resistance reading indicates an open circuit, meaning the circuit is broken somewhere between the sensor and the board.

Common failure points include the thermistor itself degrading over time, wiring harness damage from ice buildup or physical abrasion, and corroded or loose connector pins at CON9. If the wiring and connector check out normal, the sensor itself is likely faulty and will need replacement. In rare cases, a failed control board that cannot correctly read the sensor signal may also produce this error, though the sensor and wiring should always be ruled out first.

Source: manufacturer service documentation.

Common causes of Error2

  1. 01

    Faulty R1 thermistor sensor

    Part replacement

    The thermistor itself can fail due to age or moisture exposure, resulting in a short or open circuit. Resistance measured at CON9 pins 5 and 6 will read near zero or infinitely high when the sensor has failed.

  2. 02

    Damaged or broken wiring harness

    Part replacement

    The wiring between the R1 sensor and CON9 on the control board can be pinched, cut, or damaged by ice accumulation. Inspect the wire run for visible breaks, kinks, or areas where insulation has worn through.

  3. 03

    Corroded or loose connector at CON9

    Wiring / connection

    Moisture inside the refrigerator compartment can cause corrosion at the CON9 connector pins 5 and 6, creating a poor or intermittent connection. Inspecting and cleaning the connector pins may resolve the error without replacing parts.

  4. 04

    Ice buildup around the sensor

    Wiring / connection

    Excessive frost accumulation can encase the sensor and its connector, stressing the wiring or causing false resistance readings. A full manual defrost cycle should be performed before re-testing sensor resistance.

  5. 05

    Failed main control board

    Part replacement

    If the sensor, wiring, and connector all test within normal parameters, the control board itself may be misreading the input from CON9 pins 5 and 6. This is the least common cause and should only be considered after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about Error2

What does Error2 mean on a LG refrigerator?
Error2 means the R1 temperature sensor located in the upper part of the refrigerator compartment is reading abnormally, indicating either a short circuit or an open circuit. The control board cannot get a valid temperature reading from this sensor and flags the error to alert you to the problem. The primary diagnostic step is to check resistance at CON9 pins 5 and 6 where the sensor connects to the board. Without a working sensor, the refrigerator cannot properly regulate compartment temperature.
Can I fix Error2 on my LG refrigerator myself?
A knowledgeable DIYer can perform basic diagnostics such as inspecting the wiring harness and connector at CON9 for visible damage or corrosion. Measuring resistance across CON9 pins 5 and 6 with a multimeter will confirm whether the sensor has failed. Replacing the R1 thermistor sensor is a moderately straightforward repair, but if the control board is the culprit, professional service is recommended.
Is it safe to use my LG refrigerator while Error2 is displayed?
Running the refrigerator with an active Error2 code means the control board cannot accurately monitor the upper compartment temperature. This creates a risk of inadequate cooling, which could allow food to reach unsafe temperatures without any visible indication. It is best to minimize use and address the fault promptly to avoid potential food spoilage.
How much does it cost to repair Error2 on an LG refrigerator?
If the issue is limited to the R1 thermistor sensor, parts typically range from $15 to $60 depending on the specific model, with professional labor adding $80 to $200. If the wiring harness needs replacement, costs can be higher. A failed control board is the most expensive repair, with parts and labor potentially totaling $200 to $500 or more.
Will resetting my LG refrigerator clear the Error2 code?
A power reset may temporarily clear the Error2 display, but the code will return if the underlying fault with the R1 sensor or its wiring has not been corrected. Resetting is useful for confirming whether the error is persistent or intermittent, but it is not a fix. The sensor circuit at CON9 pins 5 and 6 must be inspected and repaired to permanently resolve the error.

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