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Error code reference

LG Refrigerator Error Code F-110

F-FAN Error

LG codesLG refrigerator codes

F-FAN Error - occurs when related fan motor operates but feed back signal wire contact is defective, motor wire is slipped out, or motor is defective.

First step from the service manual

Check voltage between MAIN PCB CN76 #3 (Yellow) and #1 (Gray); should be within 7V~12V.

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

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What F-110 means on a LG refrigerator

The F-110 error code on an LG refrigerator indicates a fan motor feedback signal fault. This code is triggered when the fan motor itself is running but the main control board is not receiving a valid feedback signal from the motor. Modern brushless DC fan motors used in LG refrigerators send a continuous pulse signal back to the main PCB to confirm their operating speed. When that feedback loop is broken or corrupted, the board logs the F-110 fault even though the motor may be spinning.

The three primary failure points for this code are a defective feedback signal wire connection, a wiring harness that has slipped free from the motor or board connector, or a motor that has failed internally and can no longer generate the feedback pulse. The fault is specifically associated with the fan circuit monitored at connector CN76 on the main PCB, where pin 3 (Yellow wire) carries the supply voltage and pin 1 (Gray wire) serves as the reference or ground side. A healthy circuit at this connector should read between 7V and 12V.

Because the motor may still be spinning when this code appears, technicians should not assume the fan is dead simply based on audible operation. The feedback signal wire is a separate conductor from the power supply wires, and a break or poor contact in that single wire is enough to set this code. Careful inspection of the motor connector, the wiring harness routing, and connector pin tension at CN76 should precede any component replacement.

Source: manufacturer service documentation.

Common causes of F-110

  1. 01

    Loose or disconnected feedback wire at motor connector

    Wiring / connection

    The feedback signal wire can slip out of the motor connector or lose contact at its terminal, breaking the communication between the motor and the PCB. Visually inspect the motor connector and gently tug each wire to check for looseness.

  2. 02

    Wiring harness slipped from main PCB connector CN76

    Wiring / connection

    The harness leading to CN76 on the main board can work loose over time due to vibration or movement. Check that the connector is fully seated and that the Yellow and Gray wires at pins 3 and 1 have solid contact.

  3. 03

    Defective fan motor

    Part replacement

    If the motor has failed internally, it may continue to spin but no longer produce a valid feedback pulse. If voltage at CN76 pins 3 and 1 reads within 7V to 12V but the feedback signal is still absent, the motor itself is likely the cause.

  4. 04

    Damaged or broken feedback signal wire

    Part replacement

    A wire in the harness can develop an internal break or chafe against a sharp edge, interrupting the feedback signal while the motor power wires remain intact. Inspect the full length of the harness for visible damage or pinched spots.

  5. 05

    Faulty main PCB

    Part replacement

    If wiring and the motor both test correctly but the fault persists, the CN76 circuit on the main PCB may be unable to read the feedback signal. This is the least common cause and should only be considered after all wiring and motor checks are completed.

See the test procedure for each cause

Frequently asked questions about F-110

What does F-110 mean on a LG refrigerator?
F-110 is a fan motor feedback signal error on LG refrigerators. It occurs when the main control board detects that the feedback signal wire from a fan motor is not working correctly, even though the motor may still be running. The cause can be a loose wire, a disconnected connector, or a motor that has failed internally. The circuit involved is monitored at connector CN76 on the main PCB.
Can I fix the F-110 error code myself?
Some cases of F-110 can be resolved without professional help if the cause is simply a loose or disconnected wire connector at the fan motor or at the main board. Checking that all connectors are firmly seated and that no wires are visibly damaged is a reasonable first step for a knowledgeable DIYer. However, if the fault points to a failed fan motor or a damaged PCB, those repairs are best handled by a technician with proper diagnostic tools.
Is it safe to keep using my refrigerator while the F-110 code is showing?
Running the refrigerator with an active F-110 error is not recommended for extended periods. If the fan associated with this code is not circulating air properly, food temperatures in the refrigerator or freezer compartment may rise to unsafe levels. Address the fault as soon as possible to avoid food spoilage or additional component stress.
Will resetting the refrigerator clear the F-110 error?
A power reset may temporarily clear the F-110 code, but the error will return if the underlying fault is still present. Because this code is tied to a hardware condition such as a wiring fault or a defective motor, resetting the unit without addressing the root cause is not a lasting fix. Diagnostic testing of the CN76 circuit and wiring harness is needed to resolve the issue permanently.
How much does it cost to repair the F-110 error on an LG refrigerator?
Repair costs for the F-110 error vary depending on the cause. If the fix involves reseating a loose connector, there may be no parts cost and only a service call fee, which typically falls in the range of 75 to 150 dollars. Replacing a fan motor generally adds 50 to 150 dollars in parts. If the main PCB is at fault, parts and labor combined can range from 200 to 400 dollars or more depending on the specific model.

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