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Error code reference

LG Refrigerator Error Code E2

Right compartment sensor (R2) failure

LG codesLG refrigerator codes

Right compartment sensor (R2) failure — sensor disconnected or short circuited.

First step from the service manual

Check right compartment lid sensor connector and measure sensor resistance at CON3 on main PCB (normal range 0.5V–4.5V at check point B; 0V = shorted, 5V = open).

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

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What E2 means on a LG refrigerator

The E2 error code on an LG refrigerator indicates a failure in the right compartment temperature sensor, designated R2. This sensor is a thermistor-based component responsible for monitoring the temperature inside the right compartment and feeding that data back to the main PCB so the control board can regulate cooling cycles accurately. When the control board detects a signal outside the expected voltage window at check point B on CON3, it flags the E2 fault and may suspend normal operation of that compartment.

The sensor circuit operates within a voltage range of 0.5V to 4.5V under normal conditions, measured at check point B on the main PCB connector CON3. A reading of 0V indicates a short circuit condition in the sensor or its wiring, while a reading of 5V indicates an open circuit, meaning the sensor is disconnected or the circuit has been broken. Both conditions prevent the control board from receiving valid temperature data, triggering the E2 alert.

Common root causes include a loose or corroded connector at the sensor or at CON3 on the main PCB, a damaged wiring harness with a pinched or broken wire, or a failed sensor element itself. In some cases, moisture intrusion into the connector can create intermittent short circuit conditions that produce this code. Diagnosing the fault accurately requires measuring resistance and voltage at the specified test points before replacing any components.

Source: manufacturer service documentation.

Common causes of E2

  1. 01

    Loose or disconnected sensor connector

    Wiring / connection

    The connector linking the R2 sensor to the main PCB at CON3 may have come loose, producing an open circuit reading of 5V at check point B. Inspect the connector at both the sensor end and the board end for secure seating.

  2. 02

    Corroded or damaged connector pins

    Wiring / connection

    Moisture or frost buildup inside the compartment can corrode the sensor connector pins, causing intermittent or complete signal loss. Visually inspect the pins for discoloration, oxidation, or bent contacts.

  3. 03

    Damaged wiring harness

    Part replacement

    A pinched, chafed, or broken wire in the harness between the R2 sensor and CON3 on the main PCB can cause either a short or an open circuit condition. Check the harness routing for any points where wires may contact sharp edges or moving components.

  4. 04

    Failed R2 thermistor sensor

    Part replacement

    The thermistor element inside the sensor itself can fail, producing a resistance value outside the normal operating range. If voltage at check point B reads 0V or 5V after confirming the connector and wiring are intact, the sensor likely needs replacement.

  5. 05

    Faulty main PCB

    Part replacement

    If the wiring, connector, and sensor all test within normal parameters but the E2 code persists, the main PCB may have a defect in the sensor input circuit at CON3. 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 E2

What does E2 mean on a LG refrigerator?
The E2 code indicates a failure in the right compartment temperature sensor, labeled R2. The control board has detected that the sensor signal at CON3 on the main PCB is outside the normal 0.5V to 4.5V range, pointing to either a short circuit or an open circuit condition. This means the refrigerator cannot accurately read or regulate the temperature in the right compartment.
Can I fix the E2 error code myself?
Some causes of the E2 code are DIY-friendly, particularly checking and reseating the sensor connector at CON3 on the main PCB. If the connector is secure and the wiring looks intact, measuring the voltage at check point B with a multimeter will help narrow down whether the sensor or another component needs replacement. Replacing the thermistor sensor is a moderate DIY repair, but work involving the main PCB is best left to a qualified technician.
Is it safe to keep using my refrigerator while the E2 code is showing?
Operating the refrigerator with an active E2 code carries a risk of inadequate cooling in the right compartment, which could allow food temperatures to rise to unsafe levels. It is advisable to move perishables from that section or to a separate refrigerator until the fault is diagnosed and resolved. Continuing to run the unit without addressing the fault can also potentially cause compressor or control board stress.
Will resetting the refrigerator clear the E2 error code?
A power reset by unplugging the unit for a few minutes may temporarily clear the E2 code, but it will return if the underlying sensor or wiring fault has not been corrected. Resetting is useful as a first step to confirm whether the fault is intermittent, but it is not a repair. The root cause must be identified and fixed to permanently clear the code.
How much does it cost to repair the E2 error on a LG refrigerator?
Repair costs depend on which component has failed. A replacement thermistor sensor typically costs between $15 and $50 for the part alone. If a wiring harness repair or main PCB replacement is needed, parts and labor combined can range from $150 to $400 or more. Having a technician perform a proper diagnosis before ordering parts can help avoid unnecessary expenses.

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