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Error code reference

LG Refrigerator Error Code Er IM

Abnormal Icemaker Unit

LG codesLG refrigerator codes

Abnormal Icemaker Unit - faulty icemaker unit motor or Hall IC, lead wire short circuit, or faulty motor driver.

First step from the service manual

Remove Cover PCB and check for any loose connection in CON8.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What Er IM means on a LG refrigerator

The Er IM error code on an LG refrigerator indicates an abnormal icemaker unit condition. The refrigerator's control board continuously monitors the icemaker motor operation through a Hall IC sensor, which detects the rotational position and speed of the icemaker's harvest motor. When the control board receives a signal that falls outside the expected parameters, either from the Hall IC, the motor itself, or the motor driver circuit, it flags Er IM and typically halts icemaker operation to prevent further damage.

The three primary hardware causes are a faulty icemaker motor, a failed Hall IC sensor, or a short circuit in the lead wire harness connecting the icemaker assembly to the main PCB. The Hall IC is a solid-state magnetic sensor that outputs a signal pulse as the motor rotates. If the IC fails or the motor loses torque due to internal winding failure, the control board detects the loss of expected pulse feedback and triggers the fault. A shorted or open lead wire produces a similar signal loss or an out-of-range reading.

Diagnosis begins by removing the Cover PCB and inspecting connector CON8 for any loose, corroded, or damaged pins, as a poor connection at this point is a frequent and easily corrected cause. If the connector checks out, the technician should proceed to test the icemaker motor windings for correct resistance and verify the Hall IC signal output during a harvest cycle. A faulty motor driver on the control board is also a possible cause, particularly if the motor and Hall IC test within specification.

Source: manufacturer service documentation.

Common causes of Er IM

  1. 01

    Loose or damaged connection at CON8

    Wiring / connection

    A loose, corroded, or improperly seated connector at CON8 on the PCB can interrupt the signal between the icemaker assembly and the control board. This is the first item to inspect and is often found by simply removing the Cover PCB and reseating the connector.

  2. 02

    Shorted or open icemaker lead wire harness

    Part replacement

    The wire harness running from the icemaker unit to the main PCB can develop a short circuit or open break due to repeated freezing, ice buildup, or physical wear. Inspect the full length of the harness for any visible damage, chafing, or pinching.

  3. 03

    Faulty icemaker harvest motor

    Part replacement

    The motor that drives the ice harvest cycle can fail due to worn internal windings or mechanical binding. Testing motor winding resistance will reveal whether the motor has developed an open or short condition.

  4. 04

    Failed Hall IC sensor

    Part replacement

    The Hall IC is a magnetic position sensor embedded in or near the icemaker motor assembly. If it fails, the control board receives no rotational feedback during harvest attempts and triggers Er IM. Verifying the Hall IC output signal during motor operation confirms this cause.

  5. 05

    Faulty motor driver on the control board

    Part replacement

    If the motor and Hall IC test correctly but the error persists, the motor driver circuit on the main PCB may have failed. This prevents proper voltage from reaching the motor, even though the downstream components are functional.

See the test procedure for each cause

Frequently asked questions about Er IM

What does Er IM mean on a LG refrigerator?
Er IM indicates that the LG refrigerator has detected an abnormal condition in the icemaker unit. The fault can originate from the icemaker harvest motor, the Hall IC position sensor, a short circuit in the lead wire harness, or the motor driver circuit on the control board. The refrigerator stops icemaker operation when this code appears to prevent further damage. Diagnosis starts by checking connector CON8 on the PCB for loose or damaged connections.
Can I fix Er IM on my LG refrigerator myself?
Some causes of Er IM are DIY-friendly, particularly a loose connection at CON8, which requires removing the Cover PCB and reseating the connector. Inspecting the lead wire harness for visible damage is also within reach for a careful homeowner. However, testing motor windings, verifying Hall IC output signals, and diagnosing a motor driver fault on the control board require a multimeter and some electronics knowledge, so a professional technician may be needed for those steps.
Is it safe to keep using my LG refrigerator when Er IM is displayed?
The Er IM error affects only the icemaker system, and the refrigerator's main cooling and freezing functions should continue to operate normally. It is generally safe to continue using the refrigerator for food storage while the icemaker issue is diagnosed and repaired. However, ice production will be stopped until the fault is resolved.
Will resetting my LG refrigerator clear the Er IM code?
A power reset may temporarily clear the Er IM code, but if the underlying hardware fault is still present, the error will return once the refrigerator attempts another icemaker harvest cycle. Resetting is useful for confirming whether the fault is intermittent, such as a loose connection that may reseat during power cycling, but it is not a permanent fix for a failed motor, Hall IC, or damaged wiring.
How much does it cost to repair the Er IM error on an LG refrigerator?
Repair costs vary depending on the root cause. Reseating a loose connector involves no parts cost and minimal labor. Replacing the icemaker lead wire harness or the icemaker assembly, including the motor and Hall IC, typically ranges from roughly 80 to 250 dollars in parts depending on the model, plus labor if a technician is hired. A control board replacement, if the motor driver circuit has failed, can range from 150 to 400 dollars or more for parts alone.

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