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Error code reference

Kenmore Refrigerator Error Code Er 3

Abnormal Refrigerator Sensor (1)

Kenmore codesKenmore refrigerator codes

Abnormal Refrigerator Sensor (1) - cut or short circuit wire detected on primary refrigerator temperature sensor.

First step from the service manual

Check for a loose connection in CON7.

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

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What Er 3 means on a Kenmore refrigerator

The Er 3 error code on a Kenmore refrigerator indicates an abnormal condition detected on Refrigerator Sensor 1, the primary temperature sensor monitoring the fresh food or refrigerator compartment. The control board has identified either an open circuit (cut wire) or a short circuit in the sensor circuit. These two failure modes produce opposite electrical signatures: an open circuit typically drives sensor resistance to infinity, while a short circuit collapses resistance to near zero. Either condition causes the board to lose valid temperature data for the refrigerator compartment, triggering the fault.

The first diagnostic action is to inspect the wiring harness connector designated CON7, which carries the sensor signal back to the main control board. Loose, corroded, or improperly seated connector pins at CON7 are a frequent cause of this fault and should be checked before condemning the sensor itself. Gently unplug and reseat the connector, inspect the pins for corrosion or spreading, and recheck for the fault.

If the connector is secure and the fault persists, the sensor itself or the wiring between CON7 and the sensor probe should be inspected. Wiring can be damaged by pinch points, rodent activity, or fatigue from repeated door cycling. A failed sensor will show resistance outside the expected range for the current compartment temperature. Replacing the sensor restores proper temperature feedback to the control board, allowing normal compressor and cooling cycle operation.

Source: manufacturer service documentation.

Common causes of Er 3

  1. 01

    Loose or corroded connector at CON7

    Wiring / connection

    A loose, corroded, or partially seated connector at CON7 is the most common trigger for Er 3. Unplug and firmly reseat the connector, inspect pins for oxidation or bent contacts, and clear the fault to see if it returns.

  2. 02

    Failed primary refrigerator temperature sensor

    Part replacement

    The sensor probe itself can fail internally, producing either infinite resistance (open) or near-zero resistance (short) that the control board interprets as a fault. Measuring the sensor resistance and comparing it to the expected value for the ambient temperature will confirm this failure.

  3. 03

    Damaged wiring between the sensor and CON7

    Part replacement

    The wire harness running from the sensor to CON7 can develop an open or short due to pinching, chafing against cabinet edges, or damage from repeated door cycling. Visually trace the harness and use a continuity meter to locate any break or short.

  4. 04

    Corroded or damaged sensor connector terminals

    Wiring / connection

    Even if the CON7 connector body is seated, individual pin terminals can corrode or pull back in their housing, creating an intermittent or permanent open circuit. Inspect each terminal individually and use electrical contact cleaner or replace the connector if terminals are damaged.

  5. 05

    Faulty main control board

    Part replacement

    In rare cases, the control board itself may misread the sensor circuit due to a failed input component on the board. This should only be considered after confirming the sensor resistance, wiring continuity, and connector integrity are all within spec.

See the test procedure for each cause

Frequently asked questions about Er 3

What does Er 3 mean on a Kenmore refrigerator?
Er 3 indicates an abnormal signal from Refrigerator Sensor 1, the primary temperature sensor in the refrigerator compartment. The control board has detected either an open circuit (broken or cut wire) or a short circuit in that sensor's circuit. The first step is to check the wiring connector at CON7 for a loose or corroded connection before replacing any parts.
How do I fix the Er 3 error on my Kenmore refrigerator?
Start by locating and inspecting connector CON7 in the wiring harness. Unplug it, check for corrosion or bent pins, and reseat it firmly. If the error returns, test the resistance of the primary refrigerator temperature sensor and inspect the wiring harness for any cuts, pinches, or shorts. If the sensor reads out of range, replacing it should clear the fault.
Is it safe to keep using my Kenmore refrigerator when Er 3 is displayed?
The refrigerator may continue to run in a limited capacity, but without accurate temperature feedback the compartment could become too warm or too cold without warning. It is best to monitor food temperatures closely and address the fault as soon as possible to avoid food spoilage. Do not rely on the refrigerator to maintain safe food temperatures until the sensor circuit is repaired.
Will resetting my Kenmore refrigerator clear the Er 3 code?
A power reset may temporarily clear the display, but if the underlying fault in the sensor circuit remains, the Er 3 code will return once the control board runs its diagnostics again. A permanent fix requires correcting the wiring connection or replacing the faulty sensor. Resetting without repair is not a long-term solution.
How much does it cost to repair a Kenmore refrigerator showing Er 3?
If the fix is simply reseating a loose connector at CON7, there is no parts cost involved. If the primary temperature sensor needs replacement, parts typically range from around 20 to 60 dollars depending on the specific model. Adding professional labor for diagnosis and replacement can bring the total repair cost to somewhere between 100 and 250 dollars, though costs vary by region and service provider.

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