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Error code reference

LG Refrigerator Error Code 10E

FZ-Ice Pipe Heater Error

LG codesLG refrigerator codes

FZ-Ice Pipe Heater Error — water supply pipe heater connector slip-out, contact error, or wire breakage.

First step from the service manual

Measure resistance at Main PCB CN79 Yellow-Pink wires; should be 102 ohm ±7%. 0 ohm = heater short, infinity = check for wire open or connector slip-out.

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

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What 10E means on a LG refrigerator

The 10E error code on an LG refrigerator indicates a fault in the freezer ice pipe heater circuit. This heater is a small resistance heater wrapped around or positioned along the water supply pipe that feeds the ice maker. Its job is to prevent that supply line from freezing, which would block water flow and cause ice production to fail. The control board monitors the heater circuit continuously, and when it detects an abnormal resistance reading, it logs the 10E fault and alerts the user.

The diagnostic process centers on measuring resistance at the Main PCB connector CN79, specifically across the yellow and pink wires. The correct reading should be 102 ohms within a tolerance of plus or minus 7 percent, roughly 95 to 109 ohms. A reading of 0 ohms indicates a short circuit within the heater element itself, meaning the heater has failed in a shorted state. An infinite resistance reading points to an open circuit, which could be caused by a broken heater wire, a connector that has slipped off its terminal, or a corroded contact at the CN79 connector.

The most common physical cause of this fault is connector slip-out or poor contact at the harness connector, particularly in environments where vibration or thermal cycling have loosened the connection over time. Wire breakage near stress points such as door hinges or harness routing clips is also a frequent contributor. An actual heater element failure, either shorted or open, is less common but does occur and requires heater replacement to resolve.

Source: manufacturer service documentation.

Common causes of 10E

  1. 01

    Connector slip-out at CN79

    Wiring / connection

    The harness connector at CN79 on the Main PCB can work loose over time due to vibration and thermal cycling. Inspect the yellow and pink wire connector at CN79 for any signs of it having pulled free from its seat.

  2. 02

    Poor or corroded connector contact

    Wiring / connection

    Even when the connector appears seated, individual terminals can corrode or lose their grip on the pin, causing high resistance or intermittent open circuits. Inspect the terminals inside the CN79 connector housing for oxidation, bending, or retraction.

  3. 03

    Wire breakage in the heater harness

    Part replacement

    The wiring between the Main PCB and the ice pipe heater can fracture at points where the harness bends repeatedly, such as near routing clips or at the freezer door hinge area. A visual inspection along the full length of the harness should reveal any breaks or chafing.

  4. 04

    Open circuit in the heater element

    Part replacement

    If resistance measured at CN79 reads infinite and the wiring and connectors check out, the heater element itself has likely failed internally. This requires replacement of the ice pipe heater assembly.

  5. 05

    Shorted heater element

    Part replacement

    A resistance reading of 0 ohms at CN79 indicates the heater element has shorted internally. A shorted heater cannot be repaired and the heater assembly must be replaced.

See the test procedure for each cause

Frequently asked questions about 10E

What does 10E mean on a LG refrigerator?
The 10E code indicates a fault in the freezer ice pipe heater circuit. The refrigerator monitors a small resistance heater that keeps the water supply line to the ice maker from freezing. The error is triggered when the control board detects that the heater circuit has an abnormal resistance, which can be caused by a disconnected connector, broken wire, or failed heater element.
Can I fix the 10E error myself?
In many cases, yes. The most common cause is a loose or slipped connector at the Main PCB connector CN79. If you are comfortable working inside a refrigerator and using a multimeter, you can inspect the yellow and pink wires at CN79 and measure the resistance of the heater circuit. A correct reading should be approximately 102 ohms. If the connector is secure and the resistance is out of range, a replacement heater element or wiring harness repair may be needed.
Is the 10E error dangerous?
The 10E error is not a safety hazard in the sense of fire or shock risk under normal circumstances. However, a shorted heater element should be addressed promptly, as a sustained short can stress wiring and related components. The most immediate practical effect is that your ice maker may stop working correctly if the water supply line freezes due to the heater being non-functional.
Will resetting the refrigerator clear the 10E error?
A power reset may temporarily clear the error code display, but the fault will return if the underlying cause is not repaired. The control board will re-detect the abnormal heater resistance and re-trigger the 10E code during normal operation. A lasting fix requires correcting the connector, wiring, or heater element issue.
How much does it cost to repair the 10E error on an LG refrigerator?
If the fix is simply reseating a connector, the cost is minimal, just your time. If the heater element needs replacement, parts typically range from around 20 to 60 dollars depending on the model, with professional labor adding another 80 to 150 dollars if you hire a technician. Wiring harness repairs can vary more widely depending on the extent of the damage.

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