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Error code reference

Kenmore Refrigerator Error Code Er IM Sensor

Abnormal Icemaker Sensor

Kenmore codesKenmore refrigerator codes

Abnormal Icemaker Sensor - displayed as Section B LED OFF in diagnostic display.

First step from the service manual

Check for a loose connection in CON8 on Main PCB.

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

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What Er IM Sensor means on a Kenmore refrigerator

The Er IM Sensor error code on a Kenmore refrigerator indicates an abnormal condition detected in the icemaker temperature sensor. This sensor monitors the temperature within the icemaker assembly and reports data back to the main control board. When the board receives a signal outside the expected range, whether due to an open circuit, short circuit, or out-of-range resistance reading, it triggers this fault and flags it in the diagnostic display as Section B LED OFF. The icemaker sensor is a negative temperature coefficient (NTC) thermistor, meaning its resistance decreases as temperature rises.

The primary diagnostic focus is connector CON8 on the main PCB. This connector carries the signal between the icemaker sensor and the control board. A loose, corroded, or improperly seated connection at CON8 is the first and most common point of failure, since vibration over time can cause connectors to back out of their seats. Before replacing any components, inspecting and reseating this connector is essential to rule out a simple wiring issue.

If CON8 checks out as secure and in good condition, the fault likely lies in the icemaker sensor itself or the wiring harness running to it. A failed thermistor will typically read either infinite resistance (open circuit) or near-zero resistance (short circuit) when tested with a multimeter. Damage to the wiring harness from ice buildup, pinching, or rodent activity can also produce the same abnormal signal at the main PCB.

Source: manufacturer service documentation.

Common causes of Er IM Sensor

  1. 01

    Loose connection at CON8 on Main PCB

    Wiring / connection

    The connector labeled CON8 on the main control board carries the icemaker sensor signal. Vibration or improper seating can cause this connector to back out, interrupting the signal and triggering the fault.

  2. 02

    Failed icemaker temperature sensor (thermistor)

    Part replacement

    The NTC thermistor in the icemaker assembly can fail open or short over time, sending an out-of-range signal to the main board. Testing with a multimeter will reveal infinite or near-zero resistance if the thermistor has failed.

  3. 03

    Damaged wiring harness to icemaker sensor

    Part replacement

    The wiring between the icemaker sensor and the main PCB can become pinched, cracked, or damaged by ice accumulation. Inspect the full length of the harness for visible breaks, chafing, or corrosion at connector ends.

  4. 04

    Corrosion or moisture at connector contacts

    Wiring / connection

    Moisture inside the refrigerator compartment can reach the CON8 connector and cause oxidation on the contact pins. This increases resistance in the circuit and can produce an abnormal sensor reading even if the sensor itself is functional.

  5. 05

    Faulty main PCB

    Part replacement

    If the sensor, harness, and all connectors test correctly, the main control board itself may have a failed input circuit for the icemaker sensor. This is the least common cause and should only be considered after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about Er IM Sensor

What does Er IM Sensor mean on a Kenmore refrigerator?
Er IM Sensor indicates that the refrigerator's main control board has detected an abnormal signal from the icemaker temperature sensor. In the built-in diagnostic display, this fault appears as Section B LED OFF. The code means the board cannot read a valid temperature from the icemaker sensor, which may be caused by a loose connector, a failed thermistor, or a damaged wiring harness.
How do I fix the Er IM Sensor error on my Kenmore refrigerator?
Start by locating connector CON8 on the main PCB and checking that it is fully and securely seated. If the connection is solid, test the icemaker sensor itself with a multimeter to check for an open or shorted thermistor. Also inspect the wiring harness for any visible damage between the sensor and the board. Replacing the faulty component, whether the sensor or the harness, should clear the error.
Is the Er IM Sensor error on a Kenmore refrigerator a safety issue?
This error does not pose a direct safety hazard to people or food. However, because the icemaker sensor is not functioning correctly, ice production may stop or behave erratically. The rest of the refrigerator's cooling functions are typically unaffected, so fresh and frozen food should remain at safe temperatures while you address the fault.
How much does it cost to repair the Er IM Sensor error on a Kenmore refrigerator?
If the fix is simply reseating a loose connector at CON8, there is no parts cost involved. Replacing the icemaker temperature sensor typically costs between $15 and $60 for the part depending on the specific model. If the main PCB needs replacement, costs generally range from $100 to $300 or more for the board alone, plus labor if a technician is performing the repair.
Will resetting my Kenmore refrigerator clear the Er IM Sensor error?
A power reset may temporarily clear the error code from the display, but if the underlying problem with the icemaker sensor or its wiring is still present, the code will return once the control board completes its diagnostic cycle. A lasting fix requires identifying and correcting the root cause, such as reseating the CON8 connector or replacing a faulty sensor.

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