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Error code reference

LG Refrigerator Error Code R-FAN ERROR

R-fan motor error

LG codesLG refrigerator codes

R-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. 5 ↔ 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 R-FAN ERROR means on a LG refrigerator

The R-FAN ERROR on an LG refrigerator indicates a fault in the refrigerator compartment fan motor circuit. This error is triggered when the main PCB detects an issue with the fan motor's feedback signal line, which is the communication path the motor uses to report its actual operating speed back to the control board. When the board receives no signal, an irregular signal, or a signal outside the expected range, it logs this error and may shut down the fan to prevent further damage.

The first diagnostic step is to measure the voltage at Main PCB connector CN 74, specifically between pins 5 and 7. A healthy circuit will show a voltage reading between 7V and 12V during fan operation. A reading outside this range points to a power supply problem from the board to the motor, while a reading within range but still triggering the error suggests the fault lies in the feedback signal return path or within the motor itself.

There are three primary failure modes for this error. The first is a contact failure on the feedback signal line, typically caused by a loose, corroded, or damaged connector at either the motor harness or the PCB. The second is a missing or broken motor wire, where physical damage to the wiring harness interrupts the circuit entirely. The third is an internal motor defect, where the motor's internal hall sensor or windings have failed, preventing normal operation and feedback reporting even when power is properly supplied.

Source: manufacturer service documentation.

Common causes of R-FAN ERROR

  1. 01

    Loose or corroded connector on feedback signal line

    Wiring / connection

    The connector at CN 74 pins 5 and 7 on the main PCB or at the motor harness end may be loose, corroded, or improperly seated, interrupting the feedback signal. Inspect both ends of the harness for pushed-back pins, corrosion, or debris.

  2. 02

    Broken or missing motor wire

    Part replacement

    Physical damage to the wiring harness running between the main PCB and the R-fan motor can sever the circuit completely. Visually trace the full length of the wire harness for cuts, pinches, or sections that have pulled free from connectors.

  3. 03

    Defective R-fan motor

    Part replacement

    The fan motor itself may have an internal failure, such as a failed hall effect sensor or damaged windings, causing it to stall or run without sending a valid feedback signal back to the board. If voltage at CN 74 pins 5 to 7 is within the 7V to 12V range but the error persists, the motor is the likely culprit.

  4. 04

    Main PCB fault

    Part replacement

    If the wiring and motor both test within specification, the main PCB itself may be failing to supply correct voltage or properly read the feedback signal. Confirm the CN 74 pin 5 to 7 voltage is outside the 7V to 12V range before suspecting the board.

See the test procedure for each cause

Frequently asked questions about R-FAN ERROR

What does R-FAN ERROR mean on a LG refrigerator?
The R-FAN ERROR indicates a problem with the refrigerator compartment fan motor circuit. The main control board has detected a contact failure on the feedback signal line, a broken motor wire, or an internal motor defect. This fan circulates cold air throughout the refrigerator section, and a fault here can cause uneven or inadequate cooling.
Can I fix the R-FAN ERROR myself?
Some causes of this error are DIY-friendly. Start by checking the wiring harness and connectors between the main PCB and the fan motor for loose, corroded, or damaged connections. If the connectors are secure and the wiring is intact, testing voltage at CN 74 pins 5 and 7 requires a multimeter and basic electrical knowledge. Replacing the fan motor is a moderate-difficulty repair that many experienced DIYers can complete.
Is it safe to keep using my refrigerator while this error is showing?
It is not recommended to continue using the refrigerator without addressing this error. The R-fan motor circulates air throughout the refrigerator compartment, and if it has stopped operating, food temperatures may rise into unsafe ranges relatively quickly. Check your internal temperature with a thermometer and move perishables if the fridge is not maintaining safe temperatures.
Will resetting my LG refrigerator clear the R-FAN ERROR?
A power reset may temporarily clear the error display, but the code will return if the underlying fault is still present. Because this error is tied to a hardware condition such as a wiring fault or motor failure, the error will not be permanently resolved until the root cause is diagnosed and repaired.
How much does it cost to repair an R-FAN ERROR on an LG refrigerator?
Repair costs vary depending on the cause. If the fix is simply reseating a loose connector, there is no parts cost involved. A replacement R-fan motor typically costs between $30 and $80 for the part alone. If the main PCB is the cause, board replacement can range from $100 to $250 or more for the part. Adding professional labor will increase the total cost by $75 to $200 depending on your area.

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