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Error code reference

LG Refrigerator Error Code R-EVA sensor failure

Failure of Refrigerator Eva sensor due to cut or short circuit wire; all display LEDs are on but Refrigerator…

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Failure of Refrigerator Eva sensor due to cut or short circuit wire; all display LEDs are on but Refrigerator temp display is off.

First step from the service manual

Inspect connecting wires on the Refrigerator Eva sensor.

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

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What R-EVA sensor failure means on a LG refrigerator

The R-EVA sensor failure code on an LG refrigerator indicates a fault in the refrigerator evaporator (Eva) temperature sensor. This sensor monitors the temperature of the evaporator coil inside the refrigerator compartment and sends that data to the control board to regulate the cooling cycle. When the control board cannot receive a valid signal from this sensor, it triggers the fault condition. A key symptom of this fault is that all display LEDs illuminate simultaneously while the refrigerator temperature readout goes dark, distinguishing it from other sensor faults on the unit.

The two primary causes of this error are a cut wire and a short circuit in the wiring connected to the evaporator sensor. A cut wire completely interrupts the signal path between the sensor and the control board, while a short circuit causes the sensor circuit to read an invalid value that the board cannot interpret as a legitimate temperature. Both conditions produce the same fault code and the same display behavior.

Diagnosis begins with a physical inspection of the wiring harness that connects to the refrigerator evaporator sensor. Technicians should look for visible wire damage, pinched insulation, corrosion at connector terminals, or any sign of a short caused by chafing against a sharp edge or moisture intrusion. If the wiring checks out, the sensor itself should be tested for proper resistance values at the expected operating temperature range to confirm whether the component has failed internally.

Source: manufacturer service documentation.

Common causes of R-EVA sensor failure

  1. 01

    Damaged or cut sensor wiring

    Wiring / connection

    Physical damage to the wires connecting the evaporator sensor to the control board breaks the signal circuit entirely. Inspect the harness for visible cuts, kinks, or breaks, particularly near routing clips or any sharp metal edges.

  2. 02

    Short circuit in the sensor wiring

    Wiring / connection

    A short can occur when wire insulation wears through and two conductors contact each other or a grounded surface. This sends an invalid signal to the control board, triggering the fault even if the sensor itself is intact.

  3. 03

    Corroded or loose connector terminals

    Wiring / connection

    The connector that plugs into the evaporator sensor can develop corrosion or back out of its socket, creating an intermittent or total loss of signal. Check the connector for green or white oxidation and ensure it is fully seated.

  4. 04

    Failed evaporator temperature sensor

    Part replacement

    The sensor itself can fail internally, producing an out-of-range resistance reading that the control board flags as a circuit fault. If wiring and connectors test good, the sensor should be measured for resistance and replaced if the value is outside specification.

  5. 05

    Control board fault

    Part replacement

    In rare cases, the main control board may fail to correctly read a signal that the sensor and wiring are transmitting properly. This should only be considered after the sensor and all associated wiring have been confirmed functional.

See the test procedure for each cause

Frequently asked questions about R-EVA sensor failure

What does R-EVA sensor failure mean on a LG refrigerator?
This error code indicates that the refrigerator evaporator temperature sensor has failed due to a cut or short circuit in its wiring. The control board cannot receive a valid temperature reading from the sensor, so it shuts off the refrigerator temperature display while turning on all other display LEDs simultaneously. The refrigerator compartment may not cool properly until the fault is resolved.
How do I fix the R-EVA sensor failure error on my LG refrigerator?
Start by inspecting the wiring harness connected to the refrigerator evaporator sensor for any visible damage, cuts, or signs of a short circuit. Check the connector terminals for corrosion and make sure the connector is fully plugged in. If the wiring looks intact, test the sensor's resistance to determine whether the sensor itself needs to be replaced.
Will resetting my LG refrigerator clear the R-EVA sensor failure code?
A reset may temporarily clear the code from the display, but the error will return if the underlying wiring fault or sensor failure has not been repaired. The root cause, whether a cut wire, short circuit, or failed sensor, must be corrected to permanently resolve the fault.
Is it safe to keep using my LG refrigerator while the R-EVA sensor failure code is active?
Continuing to run the refrigerator with an active evaporator sensor fault is not recommended. Without accurate temperature feedback from the sensor, the control board cannot properly regulate the cooling cycle, which puts your food at risk of spoiling. It is best to address the fault promptly or temporarily transfer perishables to another unit.
How much does it cost to repair an R-EVA sensor failure on an LG refrigerator?
If only the wiring needs repair, costs are generally lower and may fall in the range of $50 to $150 for a service call and labor. If the evaporator sensor itself needs replacement, parts and labor combined typically range from $100 to $300 depending on the specific model and local labor rates. A control board replacement, if required, would be at the higher end of the cost spectrum.

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