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Error code reference

Kenmore Dryer Error Code F-25

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

Kenmore codesKenmore dryer codes

Inlet thermistor is shorted (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-25 means on a Kenmore dryer

The F-25 error code on a Kenmore dryer indicates that the inlet thermistor circuit has shorted. A thermistor is a temperature-sensitive resistor that continuously reports air temperature to the control board during operation. The inlet thermistor specifically monitors the temperature of air entering the drum. When the control board detects that the thermistor circuit resistance has dropped to an abnormally low level, consistent with a short circuit condition, it registers F-25. This code only appears during diagnostic test mode, meaning it will not display during a normal drying cycle.

A shorted thermistor typically produces a resistance reading far below the expected operating range. In a functional thermistor, resistance decreases as temperature increases in a predictable curve. A short circuit causes resistance to collapse toward zero regardless of actual temperature, sending an inaccurate signal to the control board. This can prevent the dryer from regulating heat correctly, potentially causing overheating or a failure to heat at all.

Diagnosis begins with TEST #4a as referenced in the technical documentation. This test is designed to isolate whether the fault lies in the thermistor itself, the associated wiring harness, or the main control board. Technicians should check for damaged wiring, pinched or melted insulation, and connector corrosion before condemning the thermistor component. A direct resistance measurement across the thermistor terminals will confirm whether the component is internally shorted.

Source: manufacturer service documentation.

Common causes of F-25

  1. 01

    Failed inlet thermistor

    Part replacement

    The thermistor itself has developed an internal short, causing its resistance to drop to near zero. Measuring resistance across the thermistor terminals will confirm this if the reading is far below the expected range for the ambient temperature.

  2. 02

    Damaged wiring harness

    Wiring / connection

    The wires connecting the thermistor to the control board may be pinched, melted, or chafed, causing two conductors to contact each other and create a short. Inspect the full length of the wiring harness for visible damage or areas where insulation has worn through.

  3. 03

    Corroded or shorted connector

    Wiring / connection

    Moisture or debris in the thermistor wiring connector can create a conductive path between terminals, mimicking a short circuit. Disconnect and inspect the connector for corrosion, discoloration, or moisture contamination.

  4. 04

    Faulty control board

    Part replacement

    If the thermistor and all associated wiring test within acceptable parameters, the main control board may be incorrectly reading the thermistor circuit as shorted. This is a less common cause and should only be considered after the thermistor and wiring are ruled out.

See the test procedure for each cause

Frequently asked questions about F-25

What does F-25 mean on a Kenmore dryer?
F-25 indicates that the inlet thermistor circuit has shorted. The inlet thermistor is a temperature sensor that monitors air entering the drum and reports that temperature to the control board. This code only appears during the dryer's diagnostic test mode and points to either a failed thermistor, damaged wiring, or a faulty connector in that circuit.
How do I fix the F-25 error code on my Kenmore dryer?
The recommended starting point is TEST #4a in the technical diagnostic procedure, which walks through testing the thermistor circuit systematically. You should measure resistance across the thermistor terminals and inspect the wiring harness and connector for damage or corrosion. If the thermistor reads near zero ohms regardless of temperature, replacing the thermistor is the likely fix. If the wiring is the problem, repairing or replacing the affected section of the harness will resolve the code.
Will resetting my Kenmore dryer clear the F-25 code?
Resetting the dryer by unplugging it will clear stored error codes temporarily, but F-25 will return the next time a diagnostic test is run if the underlying fault is still present. Because this code only appears in diagnostic test mode, simply resetting the dryer and running normal cycles may not cause the code to reappear until the diagnostics are run again. The thermistor circuit should still be tested and repaired to ensure the dryer is regulating temperature correctly.
Is it safe to use my Kenmore dryer when F-25 is present?
Since F-25 only surfaces during diagnostic test mode and not during normal operation, the dryer may continue to run cycles. However, a shorted inlet thermistor means the control board is receiving inaccurate temperature data, which could affect how the dryer regulates heat. It is advisable to have the thermistor circuit tested and repaired before continued regular use to avoid potential overheating issues.
How much does it cost to repair a Kenmore dryer F-25 error?
Repair costs depend on what component is at fault. A replacement inlet thermistor typically costs somewhere in the range of $10 to $40 for the part alone. If a technician is performing the repair, labor charges will add to that total, generally bringing the full repair cost to somewhere in the $75 to $200 range depending on your location and service rates. If the control board is the cause, parts and labor costs will be higher.

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