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Error code reference

Kenmore Dryer Error Code F-24

Inlet thermistor is open (only appears in diagnostic test mode).

Kenmore codesKenmore dryer codes

Inlet thermistor is open (only appears in diagnostic test mode).

First step from the service manual

See TEST #4a, page 9.

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

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What F-24 means on a Kenmore dryer

The F-24 error code on a Kenmore dryer indicates that the inlet thermistor circuit is open. The inlet thermistor is a temperature-sensing component located at the air inlet of the dryer drum. It monitors incoming air temperature and sends resistance-based signals to the control board to regulate heating cycles. An open circuit condition means the control board is receiving no signal from the thermistor, typically because the electrical path through the sensor has been completely broken.

This fault code only appears during the dryer's diagnostic test mode, not during normal operation. That distinction is important: the dryer may still run cycles without immediately displaying F-24, but the control board cannot accurately regulate temperature without a functioning inlet thermistor. Over time, this can result in overheating, inadequate drying performance, or activation of secondary safety components such as thermal fuses.

The most common causes of an open inlet thermistor circuit include a failed thermistor with a broken internal element, damaged wiring or connectors between the thermistor and control board, or a corroded terminal connection. The diagnostic starting point is TEST #4a, which is designed to isolate the thermistor circuit and confirm whether the fault lies in the sensor itself or in the surrounding wiring harness. Technicians should check for continuity through the thermistor and inspect connector pins for signs of heat damage or corrosion before replacing components.

Source: manufacturer service documentation.

Common causes of F-24

  1. 01

    Failed inlet thermistor

    Part replacement

    The thermistor's internal sensing element can break or burn out, creating an open circuit. Testing the thermistor for continuity will confirm whether the component itself has failed.

  2. 02

    Broken or damaged wiring

    Wiring / connection

    The wiring harness running from the inlet thermistor to the control board can develop breaks due to heat exposure or physical wear. Inspecting the full wire run for cuts, melted insulation, or breaks is a key diagnostic step.

  3. 03

    Corroded or loose connector terminals

    Wiring / connection

    Connector pins at the thermistor plug or control board can corrode or back out of their housing, interrupting the circuit without the wire itself being broken. Inspect each terminal for oxidation and confirm secure seating.

  4. 04

    Control board unable to read sensor signal

    Part replacement

    In less common cases, the control board's input circuit for the thermistor can fail, causing it to interpret the sensor connection as open even when the thermistor and wiring are intact. This should only be considered after the thermistor and wiring have been confirmed good.

See the test procedure for each cause

Frequently asked questions about F-24

What does F-24 mean on a Kenmore dryer?
F-24 on a Kenmore dryer means the control board has detected an open circuit in the inlet thermistor. The inlet thermistor is the temperature sensor located at the dryer's air inlet, and an open circuit means the board is receiving no signal from it. This code only appears during diagnostic test mode. The issue is typically caused by a failed thermistor, broken wiring, or a corroded connector.
Can I fix an F-24 error myself?
A knowledgeable DIYer can diagnose this code by following the dryer's TEST #4a procedure to check the inlet thermistor circuit. Checking for continuity through the thermistor and inspecting wiring for damage are straightforward tests with a multimeter. Replacing the thermistor is a relatively accessible repair, though comfort with basic electrical testing is required. If the control board is suspected, professional diagnosis is recommended.
Is it safe to run my Kenmore dryer with an F-24 code?
Running the dryer without a functioning inlet thermistor carries risk because the control board cannot accurately monitor inlet air temperature. This can lead to overheating conditions inside the drum or tripping of other safety components such as thermal fuses or high-limit thermostats. It is best to resolve the F-24 fault before returning the dryer to regular use.
Will resetting the dryer clear the F-24 error?
Resetting the dryer will not permanently clear the F-24 code if the underlying fault in the thermistor circuit is still present. Because this code only appears in diagnostic test mode, it will return whenever diagnostics are run until the open circuit condition is repaired. The thermistor, wiring, and connectors need to be inspected and the faulty component replaced or repaired.
How much does it cost to repair an F-24 error on a Kenmore dryer?
If only the inlet thermistor needs replacement, parts typically range from $15 to $40 depending on the specific model, making it one of the more affordable dryer repairs. If the wiring harness or control board is also involved, total repair costs can range from $100 to $300 or more depending on parts and labor. Getting a diagnosis before purchasing parts is recommended to avoid unnecessary expense.

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