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Error code reference

LG Refrigerator Error Code Er IM2

Ice maker ice-making sensor not functioning

LG codesLG refrigerator codes

Ice maker ice-making sensor not functioning - short circuit.

First step from the service manual

Ensure the cable is connected at each sensor.

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

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What Er IM2 means on a LG refrigerator

The Er IM2 error code on an LG refrigerator indicates a fault in the ice maker's ice-making sensor (also called the ice tray thermistor or ice sensor). Specifically, this code is triggered by a short circuit condition in that sensor circuit. The ice-making sensor monitors the temperature of the ice tray during the freezing cycle to determine when ice has fully formed and is ready to be harvested. When the control board detects abnormally low resistance in the sensor circuit, consistent with a short circuit, it logs the Er IM2 code and may disable ice production entirely.

The most common starting point for diagnosis is verifying that the sensor cable is properly seated at both ends of its connector. A loose, pinched, or partially disconnected harness can create an electrical path that mimics a short circuit and triggers this code without any actual component failure. After confirming the wiring connections are secure, the sensor itself should be tested for proper resistance across its terminals. A shorted thermistor will typically read near zero ohms rather than the expected resistance range for the ambient temperature.

If the wiring and connectors check out, the fault may lie in the sensor component itself or, less commonly, in the ice maker assembly harness or the main control board. The ice maker module connects to the refrigerator's main control system, so any short in the sensor loop can also stress the board's input circuit. Replacing the sensor is generally the first hardware repair attempted after wiring is ruled out, as it is more accessible and lower cost than the control board.

Source: manufacturer service documentation.

Common causes of Er IM2

  1. 01

    Loose or disconnected sensor cable

    Wiring / connection

    A connector that is not fully seated at the sensor or control board can create a low-resistance path that the control board interprets as a short. Check both ends of the ice-making sensor harness and press each connector firmly into place.

  2. 02

    Failed ice-making sensor (thermistor)

    Part replacement

    The thermistor itself can develop an internal short circuit, causing it to read near zero ohms. Testing the sensor with a multimeter across its terminals will reveal a shorted condition if the resistance is far below the expected value for the current temperature.

  3. 03

    Damaged or pinched wiring harness

    Part replacement

    The wire harness running to the ice-making sensor can become pinched by ice buildup, a freezer shelf, or during reassembly after servicing. Physical damage to the insulation can cause two conductors to contact each other, creating a short.

  4. 04

    Ice or frost buildup around sensor connector

    Wiring / connection

    Moisture that has entered the sensor connector and frozen can bridge the contacts and create a short circuit. Inspect the connector for ice accumulation and allow it to fully thaw before reconnecting and retesting.

  5. 05

    Faulty ice maker control board or main control board

    Part replacement

    If the sensor and all wiring test correctly, a damaged input circuit on the control board may be misreading the sensor signal as a short. This is the least common cause and is typically diagnosed only after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about Er IM2

What does Er IM2 mean on a LG refrigerator?
Er IM2 indicates a short circuit condition in the ice maker's ice-making sensor circuit. The control board monitors this sensor to track ice tray temperature during the freezing cycle, and it throws this code when it detects abnormally low resistance consistent with a short. Ice production is typically suspended while the fault is active. The first step is checking that all sensor cable connectors are fully seated.
Can I fix the Er IM2 error myself?
In many cases, yes. Start by locating the ice-making sensor connector and pressing it firmly into place at both ends of the harness, as a loose connection is a frequent cause of this error. If the code returns after reseating the connector, you can test the sensor with a multimeter for a shorted reading and replace the component if needed. Wiring repairs and board replacement are more advanced and may require a technician.
Is it safe to use my LG refrigerator while Er IM2 is displayed?
The refrigerator's cooling and food preservation functions are generally not affected by an Er IM2 fault, which is isolated to the ice maker circuit. However, the ice maker will likely stop producing ice while the error is active. You can continue using the refrigerator for food storage while you diagnose and repair the ice maker issue.
How much does it cost to repair the Er IM2 error on an LG refrigerator?
If the fix is simply reseating a loose connector, there is no parts cost involved. Replacing the ice-making sensor thermistor typically costs between $15 and $60 for the part, depending on the specific model. If the ice maker assembly or control board requires replacement, costs can range from $80 to $300 or more for parts, plus labor if a technician is involved.
Will resetting the refrigerator clear the Er IM2 error code?
A power reset, done by unplugging the refrigerator for a few minutes and restoring power, may temporarily clear the code. However, if the underlying short circuit in the sensor or wiring has not been corrected, the error will return once the control board runs its diagnostic cycle again. A reset is useful for confirming whether the fault is intermittent, but it is not a substitute for diagnosing and repairing the root cause.

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