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Error code reference

Kenmore Refrigerator Error Code IM-Sensor

Abnormal Icemaker Sensor

Kenmore codesKenmore refrigerator codes

Abnormal Icemaker Sensor - secondary error, cut or short circuit wire on icemaker temperature sensor.

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 IM-Sensor means on a Kenmore refrigerator

The IM-Sensor error code on a Kenmore refrigerator indicates an abnormal condition detected in the icemaker temperature sensor circuit. This is classified as a secondary error, meaning it is triggered in relation to icemaker operation monitoring rather than a primary refrigeration fault. The main PCB continuously reads resistance values from the icemaker sensor to determine ice-making conditions and cycle timing. When the board detects a signal that falls outside the expected range, indicating either an open circuit (cut wire) or a closed short circuit, it logs this fault and displays the IM-Sensor code.

The sensor itself is a thermistor positioned within the icemaker assembly. A cut or broken wire in the sensor harness will cause the resistance reading to spike to an abnormally high value, while a short circuit will drive resistance toward zero. Both conditions are interpreted by the main PCB as a sensor failure. The connector most directly associated with this fault is CON8 on the main PCB, which is the first point of inspection because loose or corroded pins at this connector can mimic the electrical characteristics of a wiring fault without any physical damage to the sensor or its harness.

Common contributors include physical wire damage from ice buildup or door hinge stress, connector corrosion from moisture exposure near the icemaker compartment, and outright thermistor failure within the sensor itself. Because the sensor circuit runs from the icemaker assembly through the fresh food or freezer section wiring harness back to the main PCB, any break or short along that entire path can trigger this code. A systematic inspection starting at CON8 and working outward toward the icemaker sensor is the recommended diagnostic approach.

Source: manufacturer service documentation.

Common causes of IM-Sensor

  1. 01

    Loose or corroded connection at CON8 on the main PCB

    Wiring / connection

    A loose, corroded, or improperly seated connector at CON8 on the main PCB is the first thing to check because it can produce the same open or short circuit readings as physical wire damage. Inspect the connector for bent pins, corrosion buildup, or incomplete seating and reseat or clean it as needed.

  2. 02

    Cut or broken sensor wire in the harness

    Part replacement

    The wiring harness running from the icemaker sensor back to the main PCB can develop breaks due to ice accumulation, repeated door flex, or pinching during installation. Visually trace the harness for any visible cuts, kinks, or breaks and use a multimeter to check for continuity.

  3. 03

    Short circuit in the sensor wiring

    Wiring / connection

    Moisture intrusion near the icemaker compartment can cause two wires in the sensor circuit to contact each other, creating a short. This drives the resistance reading to near zero, which the main PCB interprets as an abnormal sensor condition.

  4. 04

    Failed icemaker temperature sensor (thermistor)

    Part replacement

    The thermistor inside the icemaker assembly can fail internally, producing readings outside the expected resistance range even when the wiring and connectors are intact. If the harness and CON8 check out, the sensor itself should be tested for correct resistance and replaced if it reads open or shorted.

  5. 05

    Damaged or faulty main PCB

    Part replacement

    If the wiring, connectors, and sensor all test within normal parameters, the issue may be a fault on the main PCB at the CON8 input circuit. A damaged PCB can misread a healthy sensor signal and incorrectly log the IM-Sensor error.

See the test procedure for each cause

Frequently asked questions about IM-Sensor

What does IM-Sensor mean on a Kenmore refrigerator?
The IM-Sensor code means the main control board has detected an abnormal signal from the icemaker temperature sensor. The fault is specifically associated with a cut wire, a short circuit, or a loose connection in the sensor circuit. The first recommended diagnostic step is to check connector CON8 on the main PCB for a loose or poor connection. If the connection is secure, the wiring harness and the sensor thermistor itself should be inspected next.
Can I fix the IM-Sensor error myself?
Yes, in many cases this error can be resolved without professional help. Start by unplugging the refrigerator, locating CON8 on the main PCB, and reseating the connector firmly. If that does not clear the code, carefully inspect the sensor wiring harness for any visible damage and test for continuity with a multimeter. Replacing a damaged harness or the sensor thermistor is a moderate repair that a confident DIYer can handle with basic tools.
Is it safe to keep using my refrigerator while the IM-Sensor code is active?
The refrigerator's cooling system will generally continue to operate with this code active because it is a secondary error related to the icemaker circuit rather than the main refrigeration system. However, the icemaker may stop functioning properly or halt ice production entirely until the fault is resolved. It is best to address the error promptly to avoid any secondary issues from unmonitored icemaker operation.
How much does it cost to repair the IM-Sensor error on a Kenmore refrigerator?
If the fix is simply reseating the CON8 connector, there is no parts cost involved. A replacement icemaker temperature sensor typically costs in the range of $20 to $60 for the part alone. If the main PCB is the root cause, board replacement can range from $100 to $300 or more depending on the model. Professional labor will add $75 to $200 or more to those estimates depending on your region.
Will resetting the refrigerator clear the IM-Sensor error code?
A power reset may temporarily clear the code from the display, but the error will return if the underlying fault in the sensor circuit has not been corrected. Resetting without repairing the root cause, whether that is a loose connector, damaged wiring, or a failed sensor, will not fix the problem. Always diagnose and repair the circuit fault first, then confirm the code does not return after restoring power.

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