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Error code reference

LG Refrigerator Error Code C-FAN ERROR

C-fan motor error

LG codesLG refrigerator codes

C-fan motor error: contact failure on feedback signal line, motor wire missing, or defect of the motor itself when operating the fan motor.

First step from the service manual

Check the voltage between Main PCB CN 74 No. 4 ↔ 7 to see if it is between 7V and 12V.

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

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What C-FAN ERROR means on a LG refrigerator

The C-FAN ERROR on an LG refrigerator indicates a fault in the condenser fan motor circuit. This error is triggered when the main PCB detects an abnormality in the feedback signal from the condenser fan motor, which is responsible for drawing air across the condenser coils to dissipate heat. The condenser fan is a critical component in the refrigeration cycle: without proper airflow over the condenser, heat cannot be rejected efficiently, leading to rising temperatures and potential compressor overload.

The error can stem from three primary sources: a contact failure on the feedback signal line between the motor and the main PCB, a missing or broken motor wire, or an internal defect within the fan motor itself. The feedback signal line sends rotational data back to the control board so the PCB can confirm the motor is running at the correct speed. If that signal is absent, interrupted, or out of range, the board throws the C-FAN ERROR to protect the system.

The first diagnostic step is to check the voltage between Main PCB connector CN 74, pins 4 and 7. A reading between 7V and 12V indicates the board is supplying proper power to the motor circuit. If the voltage is within this range but the error persists, the fault likely lies with the motor itself or the signal wiring rather than the control board. If voltage is absent or outside this range, attention should shift to the wiring harness connections and the PCB output.

Source: manufacturer service documentation.

Common causes of C-FAN ERROR

  1. 01

    Loose or corroded connector on feedback signal line

    Wiring / connection

    The connector at Main PCB CN 74 or at the motor end can work loose or corrode over time, interrupting the feedback signal. Inspect both ends of the wiring harness for pushed-back pins, corrosion, or loose seating.

  2. 02

    Defective condenser fan motor

    Part replacement

    The motor itself may have failed internally, preventing it from spinning or from sending a proper feedback signal to the PCB. If voltage at CN 74 pins 4 to 7 is within the 7V to 12V range but the motor does not run, the motor unit is likely faulty and needs replacement.

  3. 03

    Broken or missing motor wire

    Wiring / connection

    A wire in the condenser fan motor harness may be broken, cut, or completely absent. Visually trace the wiring from the motor to the main PCB and check for any visible damage, pinching, or missing conductors.

  4. 04

    Insufficient voltage from Main PCB

    Part replacement

    If the voltage measured between CN 74 pins 4 and 7 is below 7V or above 12V, the main PCB may not be supplying the correct power to the fan motor circuit. This can indicate a failing control board that is not delivering proper output.

  5. 05

    Obstructed condenser fan blade

    Wiring / connection

    Debris or ice buildup can physically block the fan blade, causing the motor to stall and triggering the error. Check the condenser fan area for obstructions before assuming an electrical fault.

See the test procedure for each cause

Frequently asked questions about C-FAN ERROR

What does C-FAN ERROR mean on a LG refrigerator?
The C-FAN ERROR means the main control board has detected a problem with the condenser fan motor circuit. This can be caused by a contact failure on the feedback signal line, a broken or missing motor wire, or a defective fan motor. The condenser fan is responsible for cooling the condenser coils, so this error needs prompt attention to prevent cooling performance issues.
How do I fix a C-FAN ERROR on my LG refrigerator?
Start by checking the voltage at Main PCB connector CN 74 between pins 4 and 7. A reading between 7V and 12V means the board is supplying power correctly, so the fault is likely in the wiring harness or the motor itself. Inspect all connectors and wiring for damage, corrosion, or loose pins, and check for any physical obstruction blocking the fan blade. If the wiring checks out and voltage is correct, the condenser fan motor likely needs to be replaced.
Will resetting my LG refrigerator clear the C-FAN ERROR?
A power cycle or reset may temporarily clear the error code, but if the underlying cause is not repaired, the code will return once the refrigerator attempts to operate the condenser fan again. Resetting is useful for confirming whether the fault is intermittent, but it is not a permanent fix for a wiring fault or a failed motor.
Is a C-FAN ERROR on an LG refrigerator dangerous?
The error itself is not a safety hazard, but ignoring it can lead to the refrigerator losing its ability to cool properly, which may cause food spoilage. Without a functioning condenser fan, heat buildup can also stress the compressor over time. It is best to diagnose and resolve the issue promptly rather than allowing the refrigerator to run in a faulted state.
How much does it cost to repair a C-FAN ERROR on an LG refrigerator?
If the problem is simply a loose connector or minor wiring issue, the repair cost may be minimal, primarily covering a service call fee in the range of $75 to $150. If the condenser fan motor needs replacement, parts typically cost between $30 and $100 depending on the model, plus labor. If the main PCB is at fault, that repair can run from $150 to $400 or more for parts and labor combined.

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