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Error code reference

LG Refrigerator Error Code F-10-ⓑ

Ice Room fan motor error

LG codesLG refrigerator codes

Ice Room fan motor error – feedback signal line contact error, motor wire separation, or motor failure during fan operation.

First step from the service manual

Measure voltage at MAIN PCB CN76-2 (Black) ↔ CN76-1 (Gray); shall be between 6V–12V.

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

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What F-10-ⓑ means on a LG refrigerator

The F-10-ⓑ error code on an LG refrigerator indicates a fault in the ice room fan motor circuit. The ice room fan is responsible for circulating air within the ice-making compartment, and this error is triggered when the main PCB detects an anomaly in the feedback signal it receives from the fan motor during operation. The fault can stem from three distinct root causes: a contact error in the feedback signal line, physical separation or disconnection of the motor wiring harness, or an internal failure of the fan motor itself.

To begin diagnosing this fault, a technician should measure the supply voltage at the main PCB connector CN76, specifically between pin CN76-2 (Black wire) and CN76-1 (Gray wire). The expected voltage range is 6V to 12V DC during normal fan operation. If voltage is present within this range but the motor is not running or the error persists, the fault likely lies in the motor itself or its feedback signal circuit rather than the PCB output. If voltage is absent or outside the specified range, attention should shift to the PCB and the wiring harness connections.

The feedback signal line is the communication path the motor uses to confirm its rotational speed back to the control board. A break or poor contact in this line will prevent the PCB from confirming that the fan is operating correctly, triggering the error even if power is being delivered to the motor. Technicians should inspect the connector at CN76 for corrosion, bent pins, or loose seating, and trace the wiring harness from the PCB to the motor for any signs of chafing, pinching, or separation before condemning the motor outright.

Source: manufacturer service documentation.

Common causes of F-10-ⓑ

  1. 01

    Loose or disconnected wiring harness

    Wiring / connection

    The wire harness connecting the ice room fan motor to the main PCB at connector CN76 may have worked loose or become physically separated. Inspect the connector for secure seating and check the full length of the harness for any breaks or disconnections.

  2. 02

    Feedback signal line contact error

    Wiring / connection

    Corrosion, bent pins, or poor contact at the CN76 connector can disrupt the feedback signal the motor sends back to the PCB, causing the board to register a fault even if the motor has power. Cleaning or reseating the connector often resolves this.

  3. 03

    Failed ice room fan motor

    Part replacement

    The fan motor itself may have failed internally, preventing it from spinning or generating the expected feedback signal. If voltage at CN76-2 to CN76-1 reads within the 6V to 12V range but the motor does not run, the motor likely needs replacement.

  4. 04

    Wiring harness damage

    Part replacement

    Physical damage to the wiring between the PCB and the fan motor, such as pinching, chafing against cabinet components, or frost damage in the ice compartment, can interrupt both the power and feedback circuits. A visual inspection of the full harness routing is recommended.

  5. 05

    Main PCB output fault

    Part replacement

    If voltage at CN76-2 to CN76-1 is absent or falls outside the 6V to 12V specification and the wiring harness checks out intact, the main PCB may not be delivering the correct output to the fan circuit. PCB replacement would be required in this scenario.

See the test procedure for each cause

Frequently asked questions about F-10-ⓑ

What does F-10-ⓑ mean on a LG refrigerator?
F-10-ⓑ is an ice room fan motor error on LG refrigerators. The code indicates that the main control board detected a problem with the ice compartment fan during operation, which can be caused by a feedback signal line contact failure, a disconnected or damaged motor wire, or a failed fan motor. The board monitors a feedback signal from the motor to confirm it is running, and any interruption in that signal triggers this fault code.
Can I fix F-10-ⓑ on my LG refrigerator myself?
Some causes of F-10-ⓑ can be addressed without professional help, particularly if the issue is a loose connector at the main PCB's CN76 port. Checking that the harness is firmly seated and inspecting visible wiring for damage are reasonable DIY steps. However, testing voltage at the PCB connector and replacing the fan motor or control board require comfort with electrical diagnosis and disassembly, which may be better suited to a qualified technician.
Is it safe to use my LG refrigerator while it shows the F-10-ⓑ error?
The ice room fan plays a key role in maintaining proper airflow within the ice-making compartment. Running the refrigerator with this error active means ice production will likely be impaired or completely stopped. The main fresh food and freezer sections may continue to operate, but it is best to have the fault diagnosed promptly to avoid any secondary effects from reduced airflow in that zone.
Will resetting my LG refrigerator clear the F-10-ⓑ error code?
A reset may temporarily clear the error code from the display, but if the underlying fault, such as a failed motor, damaged wire, or poor connector contact, has not been corrected, the F-10-ⓑ code will return once the refrigerator attempts to operate the ice room fan again. A reset is useful for confirming whether the fault is intermittent, but it does not substitute for proper diagnosis and repair.
How much does it cost to repair the F-10-ⓑ error on a LG refrigerator?
Repair costs vary depending on the root cause. If the fix involves simply reseating a connector or repairing a wire, costs may be limited to a service call fee, typically in the range of $75 to $150. Replacing the ice room fan motor generally adds $50 to $150 in parts costs on top of labor. A main PCB replacement, if required, is the most expensive scenario and can bring total repair costs into the $200 to $500 range or higher depending on the model and technician rates.

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