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Error code reference

LG Refrigerator Error Code F-FAN ERROR

F-fan motor error

LG codesLG refrigerator codes

F-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. 6 ↔ 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 F-FAN ERROR means on a LG refrigerator

The F-FAN ERROR on an LG refrigerator indicates a fault detected in the freezer fan (F-fan) motor circuit. This motor is responsible for circulating air through the freezer compartment, and the control system monitors it continuously via a feedback signal line. When the main PCB detects an anomaly on that feedback signal, the error triggers and the refrigerator logs the fault code. The three primary failure modes are: a contact failure on the feedback signal line, a missing or broken motor wire, or an internal defect in the motor itself.

The first diagnostic step is to measure the supply voltage at Main PCB connector CN 74, between pins No. 6 and No. 7. A reading between 7V and 12V confirms the PCB is supplying adequate power to the fan circuit. If the voltage falls outside this range, the main PCB may be at fault. If voltage is within spec but the fan still does not operate correctly, attention shifts to the wiring harness and the motor itself.

A faulty feedback signal prevents the PCB from confirming the motor is spinning at the correct speed. This can result from a loose connector at either the PCB or the motor terminals, a wire that has been pinched, broken, or corroded, or a motor winding that has failed internally. Because the F-fan is critical for maintaining proper freezer temperatures and preventing evaporator frost buildup, this error should be diagnosed and resolved promptly to avoid food spoilage or secondary cooling issues.

Source: manufacturer service documentation.

Common causes of F-FAN ERROR

  1. 01

    Loose or failed connector on feedback signal line

    Wiring / connection

    A poor connection at the fan motor connector or at Main PCB CN 74 pins 6 or 7 can interrupt the feedback signal and trigger this error. Inspect both ends of the harness for backed-out pins, corrosion, or loose fit.

  2. 02

    Broken or missing motor wire

    Wiring / connection

    A wire in the fan motor harness may be pinched, broken, or completely absent, preventing voltage or signal from reaching the motor. Visually trace the wiring from the PCB connector to the fan motor and check for any visible damage.

  3. 03

    Defective F-fan motor

    Part replacement

    The fan motor itself may have failed internally due to worn bearings, open windings, or a seized rotor. If wiring and connections check out and voltage at CN 74 pins 6 to 7 is between 7V and 12V, the motor is the likely culprit and will need replacement.

  4. 04

    Insufficient voltage from main PCB

    Part replacement

    If the voltage measured at CN 74 pins 6 to 7 is outside the 7V to 12V range, the main PCB may not be supplying proper power to the fan circuit. This points to a failing control board rather than the motor or wiring.

See the test procedure for each cause

Frequently asked questions about F-FAN ERROR

What does F-FAN ERROR mean on a LG refrigerator?
The F-FAN ERROR indicates a problem with the freezer fan motor circuit. The refrigerator's main PCB has detected either a contact failure on the feedback signal line, a broken or missing motor wire, or a defect in the fan motor itself. This fan is responsible for circulating cold air through the freezer, so the error should be addressed promptly to prevent cooling problems.
Can I fix the F-FAN ERROR myself on my LG refrigerator?
Some causes of this error are DIY-friendly. Start by checking the wiring harness and connectors at the fan motor and at the main PCB connector CN 74 for looseness, corrosion, or visible damage. If the connections are secure and intact, testing voltage at CN 74 pins 6 and 7 requires a multimeter. Replacing a fan motor is a moderate-difficulty repair, but diagnosing a potentially faulty PCB is best left to a qualified technician.
Will resetting my LG refrigerator clear the F-FAN ERROR?
A reset may temporarily clear the error code, but if the underlying fault still exists, the code will return once the refrigerator resumes normal operation and the control board re-detects the problem. Resetting without fixing the root cause does not resolve the issue and can delay diagnosis while the freezer continues to cool improperly.
Is it safe to keep using my LG refrigerator while the F-FAN ERROR is active?
Continuing to run the refrigerator with an active F-FAN ERROR is not recommended. Without a properly functioning freezer fan, air circulation is compromised, which can lead to inconsistent temperatures, excessive frost buildup on the evaporator, and potential food spoilage. Diagnosing and repairing the fault as soon as possible helps prevent further damage to the appliance.
How much does it cost to repair the F-FAN ERROR on an LG refrigerator?
Repair costs depend on the root cause. If the fix involves simply reseating a connector or repairing a wire, costs may be minimal if done as a DIY repair. A replacement freezer fan motor typically ranges from around $30 to $80 for the part alone, while professional labor can add $80 to $200 or more depending on your location. A faulty main PCB is the most expensive scenario, with parts and labor potentially reaching $200 to $500 or higher.

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