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Error code reference

Kenmore Refrigerator Error Code 1

Failure of freezer sensor

Kenmore codesKenmore refrigerator codes

Failure of freezer sensor – cut or short circuit wire detected on the freezer temperature sensor.

First step from the service manual

Inspect connecting wires on each sensor.

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

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What 1 means on a Kenmore refrigerator

Error code 1 on a Kenmore refrigerator indicates a failure in the freezer temperature sensor circuit. The control board has detected either an open circuit (cut or broken wire) or a short circuit condition on the wiring connected to the freezer thermistor. This thermistor is a resistive sensor that changes its resistance value in response to temperature, allowing the control board to monitor freezer compartment conditions and regulate the compressor and defrost cycles accordingly. When the circuit reads an out-of-range resistance value, the board flags it as a sensor fault.

The most common triggers for this error are damaged wiring harnesses, corroded or loose connector terminals, and failed thermistors. The wiring that runs to the freezer sensor is routed through areas subject to ice buildup, moisture, and repeated thermal cycling, all of which can degrade insulation and cause wire breaks or shorts over time. A short circuit will typically drive the resistance reading to near zero, while an open or cut wire will produce an infinite resistance reading, both of which fall outside the sensor's normal operating range.

Diagnosis begins with a visual inspection of all connecting wires and harness connectors leading to the freezer sensor. Technicians should check for pinched, frayed, or corroded wiring and reseat any loose connectors before moving on to testing the sensor itself with a multimeter. If the wiring checks out, the thermistor should be tested for proper resistance at a known temperature and replaced if it reads outside specification.

Source: manufacturer service documentation.

Common causes of 1

  1. 01

    Damaged or broken sensor wiring

    Part replacement

    A cut, pinched, or frayed wire in the harness connecting the freezer thermistor to the control board will create an open circuit. Visually trace the full length of the wiring from the sensor connector to the board, looking for any visible damage.

  2. 02

    Loose or corroded connector terminals

    Wiring / connection

    Moisture in the freezer compartment can cause connector pins to corrode or back out of their housing, interrupting the circuit. Unplug and reseat the sensor connector, and inspect the terminals for oxidation or pitting.

  3. 03

    Failed freezer thermistor

    Part replacement

    The thermistor itself can fail internally, producing a resistance value that is either zero (short) or infinite (open), both of which trigger error code 1. Test the sensor with a multimeter and compare the reading against the expected resistance at the current temperature.

  4. 04

    Shorted wiring due to ice buildup

    Part replacement

    Ice accumulation around the sensor wiring harness can compress or crack the wire insulation, causing two conductors to contact each other and create a short circuit. Inspect the area around the sensor for excess ice that may be damaging the wiring.

  5. 05

    Faulty control board

    Part replacement

    If the wiring and thermistor both test within specification, the control board's sensor input circuit may have failed, causing it to misread or reject valid sensor signals. This is the least likely cause and should only be considered after all other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about 1

What does 1 mean on a Kenmore refrigerator?
Error code 1 on a Kenmore refrigerator signals a failure in the freezer temperature sensor circuit. The control board has detected either a cut wire (open circuit) or a short circuit on the wiring connected to the freezer thermistor. This prevents the refrigerator from accurately reading the freezer temperature and can affect cooling and defrost performance. Inspection of the sensor wiring and connectors is the recommended first step.
Can I fix error code 1 on my Kenmore refrigerator myself?
A knowledgeable DIYer can perform the initial diagnostic steps, which include visually inspecting the freezer sensor wiring and reseating any loose connectors. If the wiring appears intact, testing the thermistor with a multimeter is the next step. Replacing a thermistor is a relatively straightforward repair, but if the fault lies in the control board or deep within the wiring harness, professional service is recommended.
Is it safe to keep using my refrigerator when error code 1 is displayed?
Operating the refrigerator with an active error code 1 is not advisable for extended periods. Without a functioning freezer sensor, the control board cannot accurately regulate the freezer temperature, which may result in food safety issues due to inadequate freezing. Address the fault as promptly as possible to avoid potential food spoilage.
How much does it cost to repair error code 1 on a Kenmore refrigerator?
If the repair only requires reseating a connector, there may be no parts cost involved. A replacement freezer thermistor typically costs in the range of $15 to $50 for the part. If the wiring harness needs replacement, costs can rise to the $50 to $150 range for parts, with additional labor costs if a technician is hired.
Will resetting my Kenmore refrigerator clear error code 1?
Resetting the refrigerator by unplugging it for a few minutes may temporarily clear the error code from the display, but the code will return if the underlying fault in the freezer sensor circuit has not been repaired. A reset is useful for confirming whether the fault is intermittent, but it is not a substitute for diagnosing and correcting the wiring or sensor issue.

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