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Error code reference

LG Refrigerator Error Code R-11

Ice Maker Sensor Error

LG codesLG refrigerator codes

Ice Maker Sensor Error - sensor housing slipped out, defective wire contact, wire cut, wire short, or sensor pickup temp is over 149°F (65°C) or under -58°F (-50°C).

First step from the service manual

Check voltage between MAIN PCB CN90 #8 and #4; should be within 4.5V~1.0V.

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

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What R-11 means on a LG refrigerator

The R-11 error code on an LG refrigerator indicates a fault in the ice maker temperature sensor circuit. This sensor monitors the temperature inside the ice maker compartment and reports readings back to the main control board. When the sensor signal falls outside the expected operating range, which corresponds to temperatures above 149°F (65°C) or below -58°F (-50°C), the board registers an R-11 fault. The error can also trigger if the sensor has physically dislodged from its housing or if there is a wiring problem anywhere along the sensor circuit.

The first diagnostic step is to measure the voltage between pins #8 and #4 on connector CN90 at the main PCB. Under normal operating conditions, this voltage should read between 1.0V and 4.5V. A reading outside this window confirms a fault in the sensor circuit. A voltage near 5V typically points to an open circuit such as a broken wire or disconnected sensor, while a voltage near 0V suggests a short to ground somewhere in the wiring harness.

Physical inspection is essential alongside electrical testing. The sensor housing in the ice maker assembly can slip out of its mounting position, which causes inaccurate readings even when the sensor itself is electrically functional. Wiring between the ice maker and the main PCB should be checked for cuts, pinched sections, or corroded connector terminals. If the wiring and connections test sound but the voltage is still out of range, the sensor itself is likely defective and will need to be replaced.

Source: manufacturer service documentation.

Common causes of R-11

  1. 01

    Sensor housing dislodged from mounting position

    Wiring / connection

    The ice maker sensor can physically slip out of its housing bracket, causing erratic or out-of-range temperature readings. Visually inspect the sensor in the ice maker compartment to confirm it is seated securely.

  2. 02

    Defective or failed ice maker sensor

    Part replacement

    The sensor itself can fail internally, producing a voltage reading outside the 1.0V to 4.5V range at CN90 pins #8 and #4 even when wiring is intact. Replacement of the sensor is required if wiring checks out and voltage is still abnormal.

  3. 03

    Broken or cut sensor wiring

    Part replacement

    The wire harness running from the ice maker sensor to the main PCB can develop breaks or cuts, often at points where the wire is routed through hinges or tight channels. An open circuit in this harness will typically cause the voltage at CN90 to read near 5V.

  4. 04

    Wire short in the sensor circuit

    Part replacement

    A short to ground in the sensor wiring will pull the voltage at CN90 pins #8 and #4 close to 0V. Inspect the harness for any sections where insulation has worn through and bare wire is contacting the refrigerator cabinet or other metal components.

  5. 05

    Defective wire contact or corroded connector

    Wiring / connection

    Poor contact at the connector terminal between the sensor harness and the main PCB can intermittently or permanently disrupt the sensor signal. Check CN90 for bent pins, corrosion, or a loose connector seating.

See the test procedure for each cause

Frequently asked questions about R-11

What does R-11 mean on a LG refrigerator?
R-11 is an ice maker sensor error code on LG refrigerators. It means the main control board is receiving a signal from the ice maker temperature sensor that is either out of the acceptable voltage range or completely absent. This can be caused by a dislodged sensor, damaged wiring, a short circuit, or a failed sensor that is reading temperatures above 149°F (65°C) or below -58°F (-50°C).
Can I fix the R-11 error code myself?
Some causes of R-11 are DIY-friendly. If the sensor has simply slipped out of its housing, reseating it may clear the fault without any parts needed. Similarly, reseating the connector at CN90 on the main PCB costs nothing and should be tried early. However, replacing a faulty sensor or repairing damaged wiring requires basic electrical knowledge and comfort working inside the refrigerator, so some homeowners prefer to call a technician for those repairs.
Will resetting the refrigerator clear the R-11 error?
A reset may temporarily clear the R-11 code from the display, but the fault will return if the underlying problem has not been resolved. Resetting is useful to confirm whether a fault is persistent or intermittent, but it should not be treated as a fix. The sensor circuit should be tested and the root cause corrected before relying on the ice maker again.
Is the R-11 error on my LG refrigerator a safety concern?
The R-11 error itself does not pose a direct safety hazard to your household. It is specific to the ice maker sensor circuit and does not affect the main fresh food or freezer cooling systems. However, leaving the fault unaddressed means the ice maker will likely not operate correctly, and in some cases ice production will stop entirely.
How much does it cost to repair an R-11 error on an LG refrigerator?
Repair costs vary depending on the cause. If only a connector needs to be reseated or the sensor repositioned, there may be no parts cost at all. An ice maker temperature sensor part typically falls in the range of $20 to $60 depending on the model. If a technician is needed, expect labor costs to add $80 to $150 or more on top of any parts, though prices vary by region and service provider.

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