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Error code reference

LG Refrigerator Error Code D sensor

Defrost sensor abnormal

LG codesLG refrigerator codes

Defrost sensor abnormal - short circuit or open circuit in the defrost temperature sensor.

First step from the service manual

Remove PCB cover, check for loose connection at CON6, then unplug connector and measure resistance between orange wires.

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

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What D sensor means on a LG refrigerator

The D sensor error on an LG refrigerator indicates an abnormal condition in the defrost temperature sensor circuit. This sensor monitors the temperature of the evaporator during the defrost cycle, signaling the control board when the evaporator has reached the correct temperature to terminate defrost. When the PCB detects either a short circuit or an open circuit in this sensor's wiring loop, it triggers the D sensor error code and may halt normal defrost operation.

The defrost temperature sensor connects to the main PCB through connector CON6, identifiable by its orange wires. Diagnosis begins at the PCB itself: remove the PCB cover and inspect CON6 for any loose, corroded, or improperly seated connections before proceeding further. With the connector unplugged, resistance should be measured between the two orange wires. A reading of zero ohms or near-zero indicates a short circuit, while an infinite or open resistance reading indicates a broken circuit. Normal sensor resistance will fall within a specific range depending on ambient temperature, and any reading outside the expected range confirms sensor or wiring failure.

Common causes include physical damage to the sensor wiring from ice buildup pressing against the harness, corrosion at the CON6 connector terminals from moisture intrusion, or outright failure of the sensor element itself. In some cases, the PCB may misread a healthy sensor due to a damaged trace or failed input on the board, though this is less frequent. Addressing the root cause promptly is important because a non-functional defrost sensor can lead to evaporator ice accumulation, reduced cooling performance, and potential compressor strain.

Source: manufacturer service documentation.

Common causes of D sensor

  1. 01

    Loose or corroded connector at CON6

    Wiring / connection

    The orange wire connector at CON6 on the PCB can work loose over time or develop corrosion from moisture, interrupting the sensor signal. Inspect and reseat the connector as the first diagnostic step.

  2. 02

    Failed defrost temperature sensor

    Part replacement

    The sensor element itself can fail, producing either an open circuit or a short circuit reading when resistance is measured across the orange wires. A confirmed out-of-range resistance reading means the sensor needs replacement.

  3. 03

    Damaged sensor wiring harness

    Part replacement

    Ice formation around the evaporator can press against and pinch or sever the sensor wiring, causing an open circuit. Inspect the full length of the orange wire harness for visible breaks, kinks, or ice damage.

  4. 04

    Moisture-induced short circuit in wiring

    Wiring / connection

    Water or frost intrusion into the wiring harness can cause the orange wires to short against each other or against a ground surface, producing a near-zero resistance reading. Dry the harness thoroughly and retest before replacing components.

  5. 05

    Faulty main PCB input

    Part replacement

    If the sensor and wiring both test within normal resistance ranges but the error persists, the PCB's sensor input circuit may be damaged. This is the least common cause and should only be considered after ruling out the sensor and harness.

See the test procedure for each cause

Frequently asked questions about D sensor

What does D sensor mean on a LG refrigerator?
The D sensor error means the refrigerator's control board has detected an abnormal condition in the defrost temperature sensor circuit, specifically a short circuit or open circuit. This sensor monitors evaporator temperature during the defrost cycle and is wired into the main PCB through connector CON6 via orange wires. The error prevents the refrigerator from properly managing defrost, which can lead to ice buildup and reduced cooling over time.
Can I fix the D sensor error myself?
A knowledgeable DIYer can perform the initial diagnostics, including removing the PCB cover, checking the CON6 connector for loose connections, and measuring resistance across the orange wires with a multimeter. If the connector is simply loose, reseating it may clear the error without any parts. However, if the sensor or wiring harness needs replacement, some comfort with appliance disassembly is required, and working near electrical components means the refrigerator should be unplugged before any hands-on inspection.
Is a D sensor error dangerous to ignore?
The error is not an immediate safety hazard, but ignoring it will degrade refrigerator performance over time. Without a functioning defrost sensor, the automatic defrost cycle cannot terminate correctly, allowing ice to accumulate on the evaporator coils. Heavy ice buildup restricts airflow, forces the compressor to work harder, and can eventually result in complete loss of cooling.
How much does it cost to repair a D sensor error on an LG refrigerator?
If the issue is only a loose connector at CON6, there is no parts cost at all. A replacement defrost temperature sensor typically costs between $15 and $50 depending on the specific model. If a technician is needed for diagnosis and replacement, total repair costs including labor generally range from $100 to $250. Replacing the main PCB, which is only necessary in rare cases, would be significantly more expensive.
Will resetting the refrigerator clear the D sensor error?
A power reset may temporarily clear the error code from the display, but if the underlying sensor circuit fault still exists, the code will return once the refrigerator runs through diagnostics again. A reset is not a fix for this error. The root cause, whether a loose connector, a failed sensor, or damaged wiring, must be identified and corrected to permanently resolve the D sensor error.

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