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Error code reference

LG Refrigerator Error Code 15

F compartment sensor system abnormality

LG codesLG refrigerator codes

F compartment sensor system abnormality - electric wire cut, short-circuit, contact failure, sensor housing missing, or temperature defect (displayed only when sensor detection temperature is not lower than 122°F nor higher than -58°F).

First step from the service manual

Check for electric wire cut, short-circuit, contact failure, or sensor housing missing on the F compartment sensor.

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

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What 15 means on a LG refrigerator

Error code 15 on an LG refrigerator indicates a fault detected in the freezer (F) compartment temperature sensor system. The refrigerator's control board continuously monitors the signal from the F compartment sensor and triggers this code when the detected temperature falls outside the valid operating range, specifically when the sensor reading is not lower than 122°F and not higher than -58°F. This out-of-range reading tells the control board the sensor is not functioning correctly, rather than indicating an actual temperature extreme in the compartment itself.

The root cause is almost always a wiring or physical connection issue rather than a failed sensor outright. The four primary fault conditions are: a cut or broken wire in the sensor circuit, a short-circuit within the wiring harness, a loose or corroded contact at the sensor connector, or a missing sensor housing that leaves the sensor exposed and producing inaccurate readings. Each of these conditions distorts the resistance signal the sensor sends to the control board, pushing the reading outside the acceptable detection range.

When diagnosing error code 15, begin by inspecting the wiring harness running to the F compartment sensor, looking for visible breaks, pinched sections, or signs of chafing. Check the connector for corrosion, bent pins, or incomplete seating. If the wiring and connections check out, measure the sensor resistance directly and compare it against the expected value for the compartment temperature. A sensor with out-of-range resistance at a known temperature confirms sensor failure and requires replacement.

Source: manufacturer service documentation.

Common causes of 15

  1. 01

    Loose or failed sensor connector

    Wiring / connection

    A disconnected or poorly seated connector at the F compartment sensor is the most frequent cause. Inspect the connector for bent pins, corrosion, or incomplete engagement and reseat it firmly.

  2. 02

    Cut or broken sensor wire

    Part replacement

    Physical damage to the wiring harness, often from ice buildup, door mechanisms, or previous service work, can break the circuit. Visually trace the wire from the sensor to the control board looking for damage.

  3. 03

    Short-circuit in the wiring harness

    Part replacement

    A pinched or chafed wire can cause the two conductors to contact each other, creating a short that sends an invalid signal to the control board. Check areas where the harness passes through panels or tight channels.

  4. 04

    Failed F compartment temperature sensor

    Part replacement

    The sensor itself may have failed internally, producing a resistance value outside the acceptable range even when wiring and connections are intact. Confirm by measuring sensor resistance at a known temperature.

  5. 05

    Missing sensor housing

    Part replacement

    If the sensor housing or clip that secures the sensor to its mounting point is absent, the sensor can shift position and register inaccurate temperature readings. Inspect the sensor mount and replace any missing housing components.

See the test procedure for each cause

Frequently asked questions about 15

What does 15 mean on a LG refrigerator?
Error code 15 on an LG refrigerator signals a problem with the freezer compartment temperature sensor system. The control board has detected that the sensor reading falls outside the valid range, meaning the signal is not lower than 122°F or higher than -58°F. This is caused by a wiring cut, short-circuit, contact failure, missing sensor housing, or a defective sensor. It is a sensor circuit fault, not necessarily an indication of an actual temperature problem in the freezer.
Can I fix LG error code 15 myself?
Some causes of error code 15 can be addressed without professional help. Reseating a loose connector or identifying a visibly damaged wire is within reach for a careful DIYer. However, if the wiring harness needs repair or the sensor requires replacement, basic electrical and appliance disassembly skills are needed. If you are uncomfortable working with refrigerator wiring and components, a qualified technician is the safer choice.
Is it safe to keep using my refrigerator when error code 15 is displayed?
Error code 15 means the freezer compartment sensor is not reporting reliable data, so the control board cannot accurately regulate freezer temperature. This puts food safety at risk since the refrigerator may not maintain proper cooling. It is best to address the fault promptly and avoid relying on the appliance to keep frozen foods at safe temperatures until the issue is resolved.
How much does it cost to repair LG error code 15?
If only a connector needs reseating, there may be no parts cost at all. A replacement F compartment temperature sensor typically costs in the range of $15 to $50 for the part. If a professional technician is needed, labor charges generally bring the total repair cost to somewhere between $100 and $250, depending on your location and the extent of the wiring damage.
Will resetting my LG refrigerator clear error code 15?
A reset may temporarily clear the error code from the display, but if the underlying fault in the sensor circuit has not been corrected, the code will return once the control board runs its sensor check again. Resetting is useful to confirm whether the fault is intermittent, but it is not a fix. The wiring, connector, sensor housing, and sensor itself need to be inspected and repaired or replaced as needed to permanently resolve the error.

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