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Error code reference

Kenmore Dryer Error Code F-23

Exhaust thermistor has shorted.

Kenmore codesKenmore dryer codes

Exhaust thermistor has shorted.

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-23 means on a Kenmore dryer

The F-23 error code on a Kenmore dryer indicates that the exhaust thermistor has experienced a short circuit condition. The exhaust thermistor is a temperature-sensing resistor positioned in the dryer's exhaust airflow path. Its job is to continuously report exhaust air temperature to the control board so the dryer can regulate heat output and prevent overheating. When the thermistor shorts, its resistance drops abnormally low, sending a voltage signal to the control board that falls outside acceptable parameters. The board interprets this as a fault and triggers the F-23 code, typically shutting down the heating circuit as a safety precaution.

A properly functioning exhaust thermistor operates within a specific resistance range that varies with temperature. A shorted thermistor will read near-zero ohms regardless of ambient or exhaust temperature, which is outside normal operating range. This condition can result from a failed thermistor component internally, damaged wiring in the thermistor circuit, or a connector that has corroded or shorted to ground. Moisture intrusion, heat degradation over time, or a wiring harness that has chafed against a sharp edge are common physical causes.

Diagnosis should begin with Test #4a as referenced in the dryer's technical documentation, which covers the thermistor circuit in detail. This test typically involves measuring resistance across the thermistor terminals and inspecting the wiring harness for damage, pinched wires, or failed connectors. Replacing a shorted thermistor is generally a straightforward repair, but the wiring between the thermistor and control board must also be inspected before concluding the thermistor itself is the sole failed component.

Source: manufacturer service documentation.

Common causes of F-23

  1. 01

    Failed exhaust thermistor

    Part replacement

    The thermistor itself has internally shorted, causing its resistance to read near zero ohms. This is the most common cause and is confirmed by measuring resistance across the thermistor terminals and finding a value far below the normal operating range.

  2. 02

    Damaged or pinched wiring harness

    Part replacement

    The wires connecting the thermistor to the control board may have chafed, melted, or become pinched, causing two conductors to contact each other and create a short. Inspect the harness along its full length for visible damage or contact points with metal edges.

  3. 03

    Corroded or shorted connector

    Wiring / connection

    The electrical connector at the thermistor or at the control board end of the circuit can develop corrosion or internal shorting due to moisture or heat exposure. Check connectors for discoloration, moisture residue, or melted plastic.

  4. 04

    Moisture intrusion into the thermistor circuit

    Wiring / connection

    Water entering the exhaust path or the dryer cabinet can reach the thermistor or its wiring, creating a conductive path that registers as a short. Look for signs of water staining or corrosion near the thermistor mounting location.

  5. 05

    Faulty control board

    Part replacement

    If the thermistor and all associated wiring test within normal specifications, the control board's thermistor input circuit may have failed. This is the least common 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 F-23

What does F-23 mean on a Kenmore dryer?
F-23 indicates that the exhaust thermistor has shorted. The exhaust thermistor is a temperature sensor in the dryer's exhaust path that feeds temperature data to the control board. A short in this circuit causes the resistance to read abnormally low, which the control board flags as a fault. The dryer typically stops heating or stops running entirely when this code appears.
Can I fix the F-23 error code myself?
Many technicians and experienced DIYers can resolve F-23 by testing and replacing the exhaust thermistor, which is generally an accessible component. The first step is to perform Test #4a as outlined in the dryer's diagnostic guide, which walks through measuring the thermistor circuit. If the thermistor itself is confirmed shorted and the wiring is intact, swapping the thermistor is a relatively low-difficulty repair requiring basic hand tools.
Is it safe to run my Kenmore dryer when the F-23 code is displayed?
It is not recommended to operate the dryer while this fault is active. The exhaust thermistor plays a direct role in monitoring heat levels, and running the dryer without a functioning sensor means the control board cannot accurately detect an overheating condition. Continuing to run the dryer could cause heat-related damage to internal components or create a fire hazard.
Will resetting the dryer clear the F-23 error code?
A power reset may temporarily clear the code, but it will return as soon as the control board reads the thermistor circuit again if the underlying fault has not been corrected. The shorted thermistor or wiring must be repaired or replaced to permanently resolve the error. Resetting without fixing the root cause does not make the dryer safe to use.
How much does it cost to repair a Kenmore dryer showing F-23?
If the exhaust thermistor is the failed component, parts typically cost in the range of $10 to $40 depending on the specific model. If professional labor is involved, total repair costs including parts and service generally fall in the range of $80 to $200. Control board replacement, if required, would increase costs significantly and should only be pursued after the thermistor and wiring have been ruled out.

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