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Error code reference

LG Refrigerator Error Code Er 8

Abnormal ice maker sensor

LG codesLG refrigerator codes

Abnormal ice maker sensor - short circuit in ice maker sensor.

First step from the service manual

Check ice maker sensor resistance at CON9 terminals (1,2).

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

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What Er 8 means on a LG refrigerator

The Er 8 error code on an LG refrigerator indicates an abnormal ice maker sensor condition caused by a short circuit in the ice maker temperature sensor. This sensor, sometimes called the ice maker thermistor, monitors the temperature inside the ice maker assembly and sends resistance-based signals to the main control board. When the control board detects a resistance reading that falls outside the expected range due to a short circuit condition, it triggers the Er 8 fault and may suspend ice maker operation to prevent damage.

The primary diagnostic entry point is measuring the ice maker sensor resistance directly at CON9 terminals 1 and 2 on the control board connector. A short circuit in this circuit means the resistance reading is abnormally low, near zero ohms, rather than the higher resistance value expected from a functional thermistor at normal operating temperatures. This kind of fault can originate at the sensor itself, along the wiring harness between the sensor and the board, or at the connector terminals if they are corroded, damaged, or bridged together.

Common physical causes include a thermistor that has failed internally due to moisture intrusion or mechanical damage, wiring insulation that has worn through and allowed two conductors to contact each other, or a connector that has been pinched or crimped during assembly or service. Ice maker sensors in refrigerators are exposed to freeze-thaw cycles and condensation, which accelerates degradation of both the sensor element and its wiring over time.

Source: manufacturer service documentation.

Common causes of Er 8

  1. 01

    Failed ice maker thermistor

    Part replacement

    The thermistor itself has developed an internal short circuit, causing near-zero resistance at CON9 terminals 1 and 2. This is the most frequent cause and is confirmed by measuring resistance directly at the sensor leads after disconnecting from the harness.

  2. 02

    Damaged wiring harness

    Part replacement

    The wiring between the ice maker sensor and CON9 on the control board may have worn, pinched, or cracked insulation that allows the two conductors to contact each other and create a short. Visually inspect the full length of the harness for abrasion points or kinks.

  3. 03

    Corroded or bridged connector terminals

    Wiring / connection

    Moisture and ice buildup near the ice maker can cause corrosion or ice bridging at the CON9 connector terminals, creating a false short circuit reading. Inspect the connector for visible corrosion, debris, or moisture and clean or replace as needed.

  4. 04

    Loose or improperly seated connector

    Wiring / connection

    A partially seated connector at CON9 can cause intermittent or permanent short-circuit readings. Unplug and firmly reseat the connector to rule out a connection issue before replacing any components.

See the test procedure for each cause

Frequently asked questions about Er 8

What does Er 8 mean on a LG refrigerator?
Er 8 on an LG refrigerator indicates a short circuit in the ice maker temperature sensor. The control board monitors the sensor's resistance through connector CON9 and flags this code when the reading drops abnormally low. This fault typically causes the ice maker to stop functioning until the sensor or wiring is repaired.
Can I fix the Er 8 error myself?
Some causes of Er 8 are DIY-accessible, such as reseating the CON9 connector or cleaning corroded terminals. If the sensor itself has shorted internally, replacing the ice maker thermistor is a straightforward part swap for someone comfortable with basic appliance disassembly. However, if the fault is traced to the main control board or complex wiring damage, professional repair is recommended.
Is it safe to use my LG refrigerator with an Er 8 code showing?
The refrigerator's cooling and freezing functions typically continue to operate normally with an Er 8 code present. The error is isolated to the ice maker sensor circuit, so food safety is generally not at risk. However, ice production will likely be suspended until the fault is resolved.
How much does it cost to repair an Er 8 error on an LG refrigerator?
If the ice maker thermistor is the cause, parts typically range from $15 to $50 depending on the model. If professional labor is required, total repair costs including diagnosis and installation generally fall between $100 and $250. Wiring harness repairs or control board replacements would fall at the higher end of the cost range.
Will resetting my LG refrigerator clear the Er 8 error code?
A reset may temporarily clear the Er 8 code from the display, but the error will return if the underlying short circuit in the ice maker sensor or its wiring has not been corrected. A reset is useful for confirming whether a fault is intermittent, but it is not a permanent fix. The sensor resistance at CON9 terminals 1 and 2 should be tested to confirm the fault is resolved before relying on the ice maker again.

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