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LG Refrigerator Error Code ICE PIPE HEATER Error

Ice Pipe Heater in freezer compartment has error (separation of housing part, contact error, disconnection…

LG codesLG refrigerator codes

Ice Pipe Heater in freezer compartment has error (separation of housing part, contact error, disconnection, short circuit).

First step from the service manual

With MAIN PCB CN79 disconnected, measure resistance between Blue and White; should be 72 ohm ±7%.

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

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What ICE PIPE HEATER Error means on a LG refrigerator

The ICE PIPE HEATER Error on an LG refrigerator indicates a fault in the ice pipe heater circuit located in the freezer compartment. This heater is responsible for preventing ice buildup inside the water supply line that feeds the ice maker. When the control system detects an abnormal condition in this circuit, it logs the error and may disable ice maker operation to prevent further damage or a water flow blockage.

The fault can originate from four specific conditions: physical separation of the heater housing, a poor or corroded electrical contact, an open circuit (disconnection), or a short circuit within the heater element or its wiring. To isolate the heater from the control system during diagnosis, the connector at CN79 on the main PCB must be disconnected. With the connector unplugged, resistance is measured between the Blue and White wires. The correct resistance value is 72 ohms, with an acceptable tolerance of plus or minus 7 percent, placing the valid range between approximately 67 and 77 ohms. A reading outside this range points to a failed heater element or damaged wiring.

If the resistance measures within specification, the fault likely lies in the wiring harness between the heater and the PCB, the connector itself, or the main PCB's heater monitoring circuit. Technicians should inspect the connector pins at CN79 for corrosion, bent terminals, or loose retention, and trace the wiring through the freezer compartment for any signs of chafing, pinching, or heat damage that could cause an intermittent open or short condition.

Source: manufacturer service documentation.

Common causes of ICE PIPE HEATER Error

  1. 01

    Failed heater element

    Part replacement

    The ice pipe heater element itself has burned out or broken internally, resulting in an open or out-of-range resistance reading. Measuring across the Blue and White wires at CN79 will show a resistance outside the 67 to 77 ohm range.

  2. 02

    Connector contact error at CN79

    Wiring / connection

    Corrosion, bent pins, or a loose connection at the CN79 main PCB connector can interrupt the circuit and trigger the error. Inspect the connector carefully for oxidation, debris, or terminals that have backed out of the housing.

  3. 03

    Wiring harness disconnection or damage

    Wiring / connection

    The wire harness running from the heater through the freezer compartment to the PCB can become pinched, chafed, or broken, creating an open circuit. Trace the full length of the Blue and White wires for visible damage or loose connections.

  4. 04

    Housing separation of the heater assembly

    Part replacement

    The physical housing that holds the ice pipe heater in position can separate, pulling the heater away from its electrical contacts or allowing moisture intrusion that causes a short. Inspect the heater mounting area for signs of displacement or water damage.

  5. 05

    Short circuit in the heater circuit

    Part replacement

    A short circuit within the heater element or its wiring will cause an abnormally low resistance reading or a direct connection to ground. This condition can also damage the main PCB if left unaddressed.

See the test procedure for each cause

Frequently asked questions about ICE PIPE HEATER Error

What does ICE PIPE HEATER Error mean on a LG refrigerator?
This error means the refrigerator has detected a fault in the ice pipe heater circuit inside the freezer compartment. The heater keeps the water supply line to the ice maker from freezing. The fault can be caused by a failed heater element, a wiring disconnection, a contact problem at the PCB connector, or a short circuit. Ice maker operation is typically affected when this error is active.
How do I fix the ICE PIPE HEATER Error on my LG refrigerator?
Start by disconnecting the CN79 connector on the main PCB and measuring resistance between the Blue and White wires. A reading of 72 ohms, plus or minus 7 percent, indicates the heater is good and the problem is in the connector, wiring, or PCB. A reading outside that range points to a failed heater element that will need to be replaced. Also inspect the connector pins and the wiring harness through the freezer for damage or corrosion.
Will resetting my LG refrigerator clear the ICE PIPE HEATER Error?
A power reset may temporarily clear the error code from the display, but if the underlying fault in the heater circuit still exists, the code will return. The root cause, whether it is a failed heater, damaged wiring, or a faulty connector, must be diagnosed and repaired for the error to stay cleared permanently.
Is the ICE PIPE HEATER Error on my LG refrigerator a safety concern?
This error is not an immediate safety hazard in most cases, but it should be addressed promptly. A failed ice pipe heater can cause the water supply line to freeze, blocking water flow to the ice maker and potentially causing damage to internal components over time. A short circuit condition, if present, should be repaired as soon as possible to avoid further electrical damage.
How much does it cost to repair the ICE PIPE HEATER Error on an LG refrigerator?
Repair costs depend on what component has failed. If only the wiring or connector needs to be cleaned or reseated, costs may be limited to a service call fee, typically in the range of 75 to 150 dollars. If the ice pipe heater element itself needs replacement, parts and labor combined can range from 150 to 350 dollars or more depending on the technician and your location. Diagnosing the resistance at CN79 first helps determine the exact component at fault.

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