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Error code reference

LG Refrigerator Error Code IS E

Icing sensor error caused by short or disconnection of the ice maker sensor (icing sensor or ice maker sensor)

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Icing sensor error caused by short or disconnection of the ice maker sensor (icing sensor or ice maker sensor). IS E displayed without user input indicates icing sensor error.

First step from the service manual

Check for a loose connection at the sensor connector, then check sensor resistance at Display PCB CON101 pins 1-2.

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

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What IS E means on a LG refrigerator

The IS E error code on an LG refrigerator indicates a fault in the icing sensor circuit, also called the ice maker sensor. This sensor monitors temperature conditions within the ice maker assembly to regulate the icing cycle. When the refrigerator detects either a short circuit or an open circuit (disconnection) in this sensor's wiring, it triggers the IS E code and displays it on the control panel without any user input required to call it up. The error appears autonomously, meaning the refrigerator's control system has actively flagged a problem rather than simply responding to a button press.

The icing sensor communicates with the Display PCB, and its signal is read at connector CON101, specifically across pins 1 and 2. A healthy sensor will produce a resistance reading within its specified range at a given temperature. If the resistance reads near zero (indicating a short) or is infinite or open (indicating a broken wire or failed sensor element), the Display PCB registers the fault and throws the IS E code. The sensor itself is a negative temperature coefficient (NTC) thermistor type, common in refrigeration systems.

Failures in this circuit typically stem from a few sources: physical damage to the sensor wiring harness, a connector that has vibrated loose over time, corrosion or moisture intrusion at the connector pins, or an outright failed sensor. The first diagnostic step involves inspecting the sensor connector for looseness or damage, followed by measuring resistance at CON101 pins 1 and 2 to determine whether the fault lies in the wiring or the sensor component itself.

Source: manufacturer service documentation.

Common causes of IS E

  1. 01

    Loose or disconnected sensor connector

    Wiring / connection

    The connector at the icing sensor or at Display PCB CON101 may have worked loose due to vibration. Inspect both ends of the connector for a secure, fully seated connection before doing anything else.

  2. 02

    Failed icing sensor (open circuit)

    Part replacement

    The NTC thermistor element inside the sensor can fail, resulting in an open circuit that reads as infinite resistance at CON101 pins 1 and 2. A resistance reading that is out of range confirms the sensor needs replacement.

  3. 03

    Shorted icing sensor

    Part replacement

    A short circuit within the sensor or its wiring will produce a near-zero resistance reading at CON101 pins 1 and 2. This can result from moisture intrusion, wiring insulation damage, or physical pinching of the harness.

  4. 04

    Damaged wiring harness

    Part replacement

    The wire harness running between the icing sensor and the Display PCB can be cut, pinched, or corroded. Inspect the harness along its entire length for visible damage, and check connector pins for corrosion or bent terminals.

  5. 05

    Faulty Display PCB

    Part replacement

    If the sensor and all wiring test within normal resistance values at CON101 pins 1 and 2 but the error persists, the Display PCB itself may be misreading the signal due to an internal fault. This is the least common cause and should only be considered after all other components check out.

See the test procedure for each cause

Frequently asked questions about IS E

What does IS E mean on a LG refrigerator?
IS E is an icing sensor error code indicating that the refrigerator has detected a short circuit or open circuit in the ice maker sensor circuit. The code appears on the display without any user input, meaning the control board flagged the problem on its own. It points to a fault somewhere in the sensor, its wiring, or the connector at Display PCB CON101 pins 1 and 2.
Can I fix the IS E error myself?
Some cases of IS E can be resolved without replacing parts. Start by checking that the sensor connector is fully seated and free of corrosion or damage. If the connector looks fine, you will need a multimeter to test resistance at Display PCB CON101 pins 1 and 2. If the reading is open or shorted, the sensor or harness will need to be replaced, which requires moderate DIY skill and comfort working with refrigerator wiring.
Will resetting my LG refrigerator clear the IS E code?
A reset may temporarily clear the IS E display, but the code will return if the underlying sensor fault is still present. Because the refrigerator detects and displays this error automatically without user input, it will reappear as soon as the control board checks the icing sensor circuit again. A permanent fix requires diagnosing and correcting the short or open circuit in the sensor wiring.
Is it safe to use my refrigerator while it shows IS E?
The IS E error specifically affects the ice maker sensor circuit, so the refrigerator's main cooling functions typically continue to operate. However, ice maker operation may be unreliable or completely disabled while the fault is active. It is safe to keep food stored in the refrigerator and freezer, but you should address the error promptly to restore normal ice production.
How much does it cost to repair an IS E error on an LG refrigerator?
If the fix is simply reseating a loose connector, there is no parts cost involved. If the icing sensor itself needs replacement, parts typically range from $15 to $50 depending on the model, with professional labor adding $80 to $200 or more depending on your location and the service provider. Wiring harness repairs or a Display PCB replacement will generally cost more.

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