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Error code reference

LG Refrigerator Error Code Freezer 2nd Digit c

Freezer defrost sensor error

LG codesLG refrigerator codes

Freezer defrost sensor error - connector slipped-out, open-contact, wire cut, short-circuited, or abnormal sensing temperature (+50°C and over, or -50°C and lower).

First step from the service manual

Check voltage between MAIN PCB CN30 #2 and #6; should be within 4.5V~1.0V range.

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

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What Freezer 2nd Digit c means on a LG refrigerator

The Freezer 2nd Digit c error on an LG refrigerator indicates a freezer defrost sensor fault. This sensor monitors temperature during and after defrost cycles, and the control board uses its resistance signal to determine when to terminate defrost and resume normal cooling. The Main PCB reads the sensor through connector CN30, specifically between pins 2 and 6. A healthy sensor signal will produce a voltage reading within the 4.5V to 1.0V window at that connector. Readings outside this range indicate the board is receiving no signal, an out-of-range signal, or a corrupted signal from the defrost sensor circuit.

The fault triggers under several distinct electrical conditions: a disconnected or slipped connector, an open circuit caused by a broken wire, a short circuit collapsing the signal voltage, or an actual measured temperature at or above +50°C or at or below -50°C. The last condition can occur from a legitimate sensor failure where the thermistor element itself has drifted out of specification. Because the defrost sensor is a negative temperature coefficient (NTC) thermistor, its resistance rises sharply as temperature drops and falls as temperature rises, so both open and short conditions produce extreme voltage readings that the board interprets as sensor failure.

Left unresolved, this error can disrupt the automatic defrost cycle, leading to frost accumulation on the evaporator coil. Over time, excessive frost buildup will restrict airflow through the freezer compartment and may cause temperatures to rise even while the compressor continues to run. Diagnosing this fault should begin at CN30 pins 2 and 6 on the Main PCB to determine whether the problem originates in the wiring harness or in the sensor itself.

Source: manufacturer service documentation.

Common causes of Freezer 2nd Digit c

  1. 01

    Disconnected or slipped connector at CN30

    Wiring / connection

    The wire harness connector at Main PCB CN30 pins 2 and 6 can work loose over time due to vibration. Check the connector seating first, as this is the quickest fix and requires no parts.

  2. 02

    Failed defrost sensor (thermistor)

    Part replacement

    The NTC thermistor element inside the freezer defrost sensor can fail open or short, producing voltage readings outside the 4.5V to 1.0V range at CN30. A failed sensor requires replacement.

  3. 03

    Damaged or cut sensor wiring

    Part replacement

    The wire between the defrost sensor and CN30 on the Main PCB can be pinched, chafed, or cut, creating an open or short circuit in the signal path. Inspect the full length of the harness for visible damage.

  4. 04

    Abnormal actual freezer temperature

    Wiring / connection

    If the freezer temperature has genuinely reached +50°C or higher, or -50°C or lower, the error triggers as a valid out-of-range reading rather than a sensor fault. A separate cooling system issue may be the root cause.

  5. 05

    Faulty Main PCB

    Part replacement

    If the wiring harness and sensor both test within specification but the voltage at CN30 pins 2 and 6 remains outside the 4.5V to 1.0V range, the Main PCB itself may have failed and require replacement.

See the test procedure for each cause

Frequently asked questions about Freezer 2nd Digit c

What does Freezer 2nd Digit c mean on a LG refrigerator?
This code indicates a defrost sensor error in the freezer compartment. The Main PCB has detected that the signal from the freezer defrost sensor is outside the acceptable voltage range at connector CN30 pins 2 and 6, which spans 4.5V to 1.0V. The fault can be caused by a loose connector, broken wire, short circuit, or a sensor that has failed internally. It can also trigger if the actual sensed temperature reaches or exceeds +50°C or drops to -50°C or lower.
How do I fix the Freezer 2nd Digit c error on my LG refrigerator?
Start by checking the connector at Main PCB CN30 pins 2 and 6 to confirm it is fully seated and not corroded. If the connector is secure, test the voltage between those two pins to see whether it falls within the 4.5V to 1.0V range. A reading outside this range points to either a wiring fault along the sensor harness or a defective defrost sensor that will need to be replaced. If wiring and sensor both test correctly, the Main PCB may be the source of the fault.
Is it safe to keep using my LG refrigerator when this error is displayed?
Continued use is not recommended without addressing the error. A non-functioning defrost sensor means the control board cannot properly manage defrost cycles, which will lead to frost accumulation on the freezer evaporator over time. This frost buildup can block airflow and cause the freezer to lose cooling capacity. Food safety can be at risk if temperatures rise as a result.
How much does it cost to repair the Freezer 2nd Digit c error on an LG refrigerator?
If only the defrost sensor needs replacement, parts typically range from $15 to $60 depending on the specific model, with professional labor adding $80 to $150 on top of that. If the Main PCB is the cause, parts alone can range from $100 to $300 or more, making professional repair more expensive. A loose connector or minor wiring repair completed by a DIYer carries minimal cost beyond tools and time.
Will resetting my LG refrigerator clear the Freezer 2nd Digit c error?
A reset may temporarily clear the error code from the display, but the code will return as soon as the Main PCB re-evaluates the defrost sensor signal and finds it out of range. The underlying fault in the sensor, wiring, or connector must be corrected for the error to stay cleared. Resetting without repair does not resolve the defrost cycle issue and can allow frost to continue accumulating.

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