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Error code reference

LG Refrigerator Error Code E3

Outside temperature sensor error (located on display); all LEDs on the right compartment fermentation…

LG codesLG refrigerator codes

Outside temperature sensor error (located on display); all LEDs on the right compartment fermentation remaining time display except for time LED are turned on when Store Kimchi buttons on the right and left compartments are pressed simultaneously.

First step from the service manual

Check outside sensor at pins 2 and 5 of CON5; measure sensor resistance.

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

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What E3 means on a LG refrigerator

The E3 error code on an LG refrigerator indicates a fault with the outside temperature sensor, which is physically located on the display panel. This sensor monitors ambient or external temperature conditions and reports data to the control board. When the system detects that the sensor signal is outside of acceptable parameters, such as an open circuit or short circuit condition, it flags the E3 code. The error is surfaced through the display in a specific way: when the Store Kimchi buttons on both the right and left compartments are pressed simultaneously, all LEDs on the right compartment fermentation remaining time display will illuminate except for the time LED itself.

The primary diagnostic focus for E3 is the outside sensor circuit at connector CON5, specifically pins 2 and 5. Technicians should measure the resistance of the sensor directly at those pins to determine whether the sensor is within its expected range. A reading that is significantly out of range, whether it reads open (infinite resistance) or shorted (near zero resistance), confirms the sensor has failed. Intermittent resistance readings can indicate a failing sensor or a damaged wiring harness between the sensor and the connector.

Common root causes include a failed sensor due to moisture intrusion or physical damage, corroded or loose connections at CON5, and wiring harness damage along the routing path from the display to the control board. Because this sensor is integrated with the display assembly, damage to the display panel itself can also affect sensor circuit continuity. Proper diagnosis requires a multimeter and access to CON5 on the control board.

Source: manufacturer service documentation.

Common causes of E3

  1. 01

    Failed outside temperature sensor

    Part replacement

    The sensor itself has failed due to age, moisture exposure, or physical damage, causing it to read outside the expected resistance range at CON5 pins 2 and 5. This is the most common cause and requires replacing the sensor or display assembly.

  2. 02

    Loose or corroded connector at CON5

    Wiring / connection

    Poor contact at pins 2 and 5 of CON5 can cause intermittent or incorrect resistance readings without the sensor itself being defective. Inspect the connector for corrosion, bent pins, or incomplete seating and reseat or clean as needed.

  3. 03

    Damaged wiring harness

    Part replacement

    The wiring between the display-mounted sensor and CON5 on the control board may be pinched, chafed, or broken, causing an open or short in the circuit. A continuity check along the harness will help isolate the damage location.

  4. 04

    Display panel damage

    Part replacement

    Because the outside temperature sensor is located on the display panel, physical damage to the display assembly can disrupt the sensor circuit. If the sensor and wiring check out but the fault persists, the display assembly may need replacement.

See the test procedure for each cause

Frequently asked questions about E3

What does E3 mean on a LG refrigerator?
E3 indicates an outside temperature sensor error on an LG refrigerator. The sensor is located on the display panel and the error appears when the control board detects the sensor signal is out of range. You can confirm the error by pressing the Store Kimchi buttons on both compartments simultaneously, which causes all LEDs on the right compartment fermentation remaining time display except the time LED to illuminate.
How do I fix an E3 error on my LG refrigerator?
Start by checking the sensor resistance at pins 2 and 5 of connector CON5 on the control board using a multimeter. If the resistance is out of the expected range, the sensor has likely failed and needs to be replaced. Also inspect the wiring harness and connector at CON5 for damage or corrosion, as connection issues can produce the same error without the sensor itself being defective.
Will resetting my LG refrigerator clear the E3 error code?
A reset may temporarily clear the E3 code from the display, but the error will return if the underlying sensor fault is not corrected. Because E3 reflects an active circuit fault, the control board will re-detect the problem and re-trigger the code once it resumes normal monitoring. Proper repair of the sensor or wiring is required to permanently clear the error.
Is it safe to continue using my LG refrigerator while E3 is displayed?
A faulty outside temperature sensor can affect the refrigerator's ability to regulate temperature accurately, which may compromise food safety over time. While the unit may continue to run, it is advisable to have the fault diagnosed and repaired promptly. Monitor internal temperatures with a thermometer until the repair is completed.
How much does it cost to repair an E3 error on an LG refrigerator?
Repair costs vary depending on the specific failed component. If only the wiring or connector needs attention, costs may be limited to a service call fee in the range of $75 to $150. If the sensor or display assembly requires replacement, parts and labor combined can range from $150 to $400 or more depending on the model and your location.

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