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Error code reference

Kenmore Refrigerator Error Code F-Sensor

Abnormal Freezer Sensor

Kenmore codesKenmore refrigerator codes

Abnormal Freezer Sensor - cut or short circuit wire detected on freezer temperature sensor.

First step from the service manual

Check for a loose connection in CON6 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 F-Sensor means on a Kenmore refrigerator

The F-Sensor error code on a Kenmore refrigerator indicates an abnormal condition detected on the freezer temperature sensor circuit. The main PCB continuously monitors the resistance output of the freezer thermistor to track compartment temperature. When the control board reads a signal that falls outside the expected resistance range, either extremely high resistance indicating an open/cut wire or extremely low resistance indicating a short circuit, it triggers this fault code and may disable normal cooling operation in the freezer section.

The freezer temperature sensor is a negative temperature coefficient (NTC) thermistor that changes resistance in response to temperature. A cut or broken wire in the sensor circuit causes resistance to spike toward infinity, while a short circuit between wires drops resistance to near zero. Both conditions produce temperature readings the board recognizes as physically impossible, prompting the F-Sensor fault. The sensor circuit connects to the main PCB through connector CON6, making that junction a critical point of potential failure.

The most common entry point for diagnosis is a loose or corroded connection at CON6 on the main PCB. Vibration, moisture, and thermal cycling inside the refrigerator cabinet can loosen harness connectors over time, mimicking a sensor failure even when the thermistor itself is intact. After confirming the connection is secure, technicians should test the thermistor resistance directly and inspect the wiring harness for damage, kinks, or pinched sections that may have caused an open or short in the circuit.

Source: manufacturer service documentation.

Common causes of F-Sensor

  1. 01

    Loose or disconnected wiring at CON6 on Main PCB

    Wiring / connection

    The harness connector at CON6 on the main PCB can loosen over time due to vibration and thermal cycling. Reseating this connector firmly is the first diagnostic step and may resolve the error without replacing any parts.

  2. 02

    Failed or open-circuit freezer thermistor

    Part replacement

    The freezer temperature sensor itself may have failed internally, producing an open circuit and an out-of-range resistance reading. Testing the thermistor with a multimeter at room temperature will reveal whether its resistance value is within the expected range for its temperature.

  3. 03

    Cut or damaged sensor wiring harness

    Part replacement

    The wire harness running from the freezer sensor to the main PCB may be cut, pinched, or chafed, creating an open or shorted circuit. Inspect the full length of the harness for visible damage, especially at points where it passes through cabinet walls or around shelving hardware.

  4. 04

    Short circuit in the sensor circuit

    Part replacement

    Two wires in the sensor circuit may be contacting each other due to damaged insulation, causing resistance to drop near zero and triggering the fault. A multimeter continuity check between the sensor wires (disconnected from the board) can confirm a short.

  5. 05

    Faulty main PCB

    Part replacement

    If the wiring harness and thermistor both test correctly, the main PCB itself may be misreading the sensor signal due to a failed input circuit or damaged connector pins on CON6. Board replacement is typically a last resort after all wiring and sensor checks are complete.

See the test procedure for each cause

Frequently asked questions about F-Sensor

What does F-Sensor mean on a Kenmore refrigerator?
The F-Sensor error code means the main control board has detected an abnormal signal from the freezer temperature sensor. The board has identified either an open circuit, such as a cut wire, or a short circuit in the sensor wiring. This prevents the refrigerator from accurately monitoring freezer temperature, and cooling performance may be affected until the fault is corrected.
How do I fix the F-Sensor error on my Kenmore refrigerator?
Start by checking the wiring harness connector at CON6 on the main PCB and reseating it firmly. If the error persists, test the freezer thermistor with a multimeter to verify its resistance is within a normal range for its current temperature. Inspect the sensor wiring harness for any cuts, pinched sections, or signs of a short circuit. If the sensor and wiring are both intact, the main PCB may need to be replaced.
Will resetting my Kenmore refrigerator clear the F-Sensor code?
A reset may temporarily clear the error code, but it will return if the underlying wiring or sensor problem has not been corrected. Resetting without repairing the fault does not restore accurate freezer temperature monitoring. The code should be diagnosed and the defective component repaired or replaced for a lasting fix.
Is it safe to keep using my refrigerator while the F-Sensor code is active?
It is not advisable to rely on the refrigerator for food storage while this error is active. Because the control board cannot read a valid freezer temperature, the cooling system may run incorrectly, potentially allowing freezer temperatures to rise to unsafe levels. Perishable foods in the freezer should be monitored closely or moved to another unit until the repair is completed.
How much does it cost to repair the F-Sensor error on a Kenmore refrigerator?
Repair costs depend on which component has failed. A replacement freezer thermistor is generally an inexpensive part, typically in the range of $15 to $50 for the part alone. If the main PCB needs replacement, costs rise significantly, often ranging from $100 to $300 or more for the board plus labor. A professional diagnostic visit typically costs between $75 and $150 before any parts are factored in.

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