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Error code reference

Kenmore Dryer Error Code F-45

Motor control electronics speed sensor failure.

Kenmore codesKenmore dryer codes

Motor control electronics speed sensor failure.

First step from the service manual

See TEST #3b, page 8.

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

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What F-45 means on a Kenmore dryer

The F-45 error code on a Kenmore dryer indicates a motor control electronics speed sensor failure. This fault is generated when the motor control board loses communication with or receives invalid feedback from the speed sensor, which monitors the rotational speed of the drive motor. The speed sensor is a critical component that allows the control electronics to verify the motor is running at the correct RPM during operation. When the board cannot confirm proper motor speed, it triggers this fault and halts the drying cycle to prevent potential damage.

The speed sensor on these dryers is typically integrated into the motor circuit and sends a signal back to the motor control board during operation. A failure can originate from a faulty speed sensor itself, a problem with the motor control board, or wiring issues between these components. Loose connectors, damaged wiring harnesses, or corrosion on terminals can all interrupt the signal path and produce an F-45 code even when the sensor and board are otherwise functional.

Diagnosis should begin with TEST #3b as outlined in the technical reference material for this model. This test is specifically designed to isolate whether the fault lies in the speed sensor, the wiring, or the motor control board itself. Technicians should inspect all related connectors and harness routing before condemning any individual component, as connection issues are a frequent root cause of sensor-related fault codes.

Source: manufacturer service documentation.

Common causes of F-45

  1. 01

    Faulty speed sensor

    Part replacement

    The speed sensor itself may have failed and is no longer sending a valid signal to the motor control board. This is one of the most direct causes of an F-45 code and can be confirmed through the diagnostic test referenced in the error code data.

  2. 02

    Loose or damaged wiring connections

    Wiring / connection

    Connectors between the speed sensor and the motor control board can become loose, corroded, or damaged over time. Inspecting and reseating all related connectors is an important early step before replacing any components.

  3. 03

    Motor control board failure

    Part replacement

    The motor control electronics themselves may have failed and are unable to properly process the speed sensor signal. This is typically diagnosed after ruling out the sensor and wiring as the source of the fault.

  4. 04

    Drive motor failure

    Part replacement

    If the drive motor is failing or has seized, it may not be spinning at a detectable speed, causing the control board to log a speed sensor fault. The motor should be evaluated if the sensor and wiring check out as functional.

  5. 05

    Damaged wiring harness

    Wiring / connection

    Chafed, pinched, or broken wires in the harness running to the speed sensor can interrupt the signal path and produce an F-45 fault. A careful visual inspection of the harness routing can help identify this issue.

See the test procedure for each cause

Frequently asked questions about F-45

What does F-45 mean on a Kenmore dryer?
F-45 on a Kenmore dryer means the motor control electronics have detected a speed sensor failure. The motor control board is not receiving a valid signal confirming the drive motor's rotational speed. This causes the dryer to stop operating to prevent potential damage. Diagnosis should begin with TEST #3b to isolate the faulty component.
Can I fix an F-45 error on my Kenmore dryer myself?
A knowledgeable DIYer may be able to address this fault if the cause is a loose connector or damaged wire, as these require only basic tools and inspection skills. However, if the speed sensor or motor control board needs replacement, the repair becomes more involved and requires comfort working with dryer internals. Following the specific diagnostic test referenced for this code is strongly recommended before purchasing any parts.
Is it safe to use my Kenmore dryer when it shows an F-45 error?
You should not attempt to continue using the dryer while the F-45 code is active. The control board has halted operation because it cannot confirm the motor is running correctly, and bypassing this fault could lead to motor damage or overheating. The dryer should remain out of service until the fault is properly diagnosed and repaired.
How much does it cost to repair an F-45 error on a Kenmore dryer?
Repair costs vary depending on which component has failed. If the issue is a wiring connection, the cost may be minimal beyond a service call fee, typically in the range of $75 to $150. Replacing a speed sensor or motor control board will add parts costs, which generally range from $50 to $300 depending on the specific board or sensor required. Labor charges from a technician will add to the total.
Will resetting my Kenmore dryer clear the F-45 error code?
A power reset may temporarily clear the F-45 code, but if the underlying problem with the speed sensor or motor control electronics is still present, the fault will return when the dryer attempts to run again. Resetting is not a fix for this error. The root cause must be identified and corrected through proper diagnostic testing to resolve the issue permanently.

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