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Error code reference

LG Refrigerator Error Code R-Eva sensor failure (R.temp display off)

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

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Failure of Refrigerator Eva sensor due to cut or short circuit wire; indicated by all display LEDs on but Refrigerator temp display 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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  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What R-Eva sensor failure (R.temp display off) means on a LG refrigerator

The R-Eva sensor failure code on an LG refrigerator indicates that the evaporator temperature sensor located in the refrigerator compartment has failed or lost continuity with the control board. This sensor, sometimes called the refrigerator evaporator thermistor, monitors the temperature of the evaporator coil in the fresh food section. When the control board cannot receive a valid signal from this sensor, it disables the refrigerator temperature display while leaving all other display LEDs active. This specific combination, all display indicators on but the refrigerator temp readout blank, is the distinguishing symptom of this fault.

The two primary causes of this failure are a cut wire in the sensor harness or a short circuit within the wiring. A cut or broken wire interrupts the signal path entirely, resulting in an open circuit condition. A short circuit, where two conductors make unintended contact, sends an out-of-range signal that the control board interprets as a sensor fault. Both conditions prevent the board from calculating accurate evaporator temperatures, which can affect defrost cycle management and compartment cooling performance over time.

Diagnosis begins with a physical inspection of the wiring harness connecting the R-Eva sensor to the control board. Technicians should look for visible wire damage, pinch points, signs of rodent activity, or connector corrosion. If the wiring is intact, the sensor itself should be tested for correct resistance values at a known temperature. Resistance that falls outside the expected range for the ambient conditions points to a failed sensor rather than a wiring problem.

Source: manufacturer service documentation.

Common causes of R-Eva sensor failure (R.temp display off)

  1. 01

    Cut or broken sensor wire

    Part replacement

    Physical damage to the wiring harness connecting the evaporator sensor to the control board creates an open circuit. Inspect the full length of the wire for breaks, fraying, or pinch points caused by cabinet components.

  2. 02

    Short circuit in the sensor wiring

    Part replacement

    Two conductors in the harness making unintended contact send an invalid signal to the control board. Look for areas where insulation has worn away and bare wires may be touching each other or a grounded surface.

  3. 03

    Loose or corroded connector

    Wiring / connection

    The connector between the sensor harness and the main wiring loom can loosen over time or develop corrosion that increases resistance and disrupts the signal. Disconnect, inspect, and reseat the connector to rule this out before replacing parts.

  4. 04

    Failed evaporator thermistor

    Part replacement

    The sensor element itself can fail internally, producing a resistance value outside the acceptable range even when the wiring is intact. If wiring checks out, test the sensor resistance directly at its terminals.

See the test procedure for each cause

Frequently asked questions about R-Eva sensor failure (R.temp display off)

What does R-Eva sensor failure (R.temp display off) mean on a LG refrigerator?
This error code means the refrigerator compartment evaporator sensor has stopped communicating with the control board due to a cut wire, short circuit, or sensor failure. The control board responds by turning off the refrigerator temperature display while leaving all other LEDs active. The sensor is responsible for monitoring the evaporator coil temperature in the fresh food section. Without a valid reading, the board cannot properly manage cooling and defrost cycles.
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, looking for cuts, pinched wires, or loose connectors. Reconnect or repair any damaged wiring and reseat the connector firmly. If the wiring appears intact, the sensor itself should be tested with a multimeter to check its resistance. A sensor that reads outside the expected range at a known temperature will need to be replaced.
Is it safe to keep using my LG refrigerator while the R-Eva sensor error is active?
Short-term use is generally possible, but the refrigerator may not maintain temperatures as accurately without a functioning evaporator sensor. Defrost cycle timing can be affected, which may eventually lead to frost buildup on the evaporator coil and reduced cooling performance. It is best to address the fault promptly to avoid food safety risks and potential secondary damage.
Will resetting my LG refrigerator clear the R-Eva sensor failure code?
A power reset will not permanently clear this error if the underlying wiring or sensor fault still exists. The code will return as soon as the control board attempts to read the sensor again. The root cause, whether a damaged wire, faulty connector, or failed thermistor, must be corrected before the error will clear and stay clear.
How much does it cost to repair the R-Eva sensor failure on an LG refrigerator?
Repair costs vary depending on whether the issue is a wiring repair or a full sensor replacement. Sensor parts typically range from $15 to $60, while professional labor for diagnosis and repair can add $80 to $200 depending on your location and the complexity of accessing the evaporator compartment. If only a connector or wire repair is needed, total costs may fall on the lower end of that range.

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