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Error code reference

Kenmore Dryer Error Code F3E2

Exhaust thermistor has shorted; temperature above 250°F (<500 ohms).

Kenmore codesKenmore dryer codes

Exhaust thermistor has shorted; temperature above 250°F (<500 ohms).

First step from the service manual

See TEST #4a: Thermistors, page 15.

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

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What F3E2 means on a Kenmore dryer

The F3E2 error code on a Kenmore dryer indicates that the exhaust thermistor has experienced an electrical short, causing the control board to detect a resistance reading below 500 ohms. The exhaust thermistor is a temperature-sensing component located in the exhaust duct path that continuously monitors outgoing air temperature during the drying cycle. Under normal operating conditions, the thermistor resistance changes predictably with temperature, allowing the control board to regulate heat output. When resistance drops below 500 ohms, the board interprets this as a temperature above 250 degrees Fahrenheit, which triggers the F3E2 fault.

A shorted thermistor typically occurs due to one of several conditions: physical damage to the thermistor itself, a wiring harness fault causing two conductors to contact each other, or moisture and debris compromising the sensor element. Unlike an open-circuit failure, a short drives the resistance artificially low, making the control board believe the exhaust temperature is dangerously high even if the dryer is running normally or is cold. This can cause the dryer to shut down prematurely or refuse to start a heat cycle.

Diagnosis should begin with TEST #4a covering the thermistor circuit, as referenced in the dryer service documentation. This test involves measuring resistance at the thermistor connector and tracing continuity through the associated wiring harness. Technicians should inspect the thermistor connector for corrosion, pinched wires along the exhaust duct path, and physical damage to the sensor body before condemning the thermistor itself.

Source: manufacturer service documentation.

Common causes of F3E2

  1. 01

    Failed exhaust thermistor

    Part replacement

    The thermistor itself has internally shorted, causing resistance to drop below 500 ohms regardless of actual temperature. This is confirmed by measuring thermistor resistance directly at the component terminals and finding a reading below the specified range.

  2. 02

    Shorted or pinched wiring harness

    Wiring / connection

    Wires running to the exhaust thermistor can become pinched against the dryer cabinet or exhaust duct, causing insulation to wear through and the conductors to contact each other. Visually inspect the entire wire run from the thermistor connector back to the control board for damage.

  3. 03

    Corroded or damaged thermistor connector

    Wiring / connection

    Moisture or lint accumulation at the thermistor wiring connector can cause corrosion that bridges the connector terminals, producing a false short circuit reading. Inspect the connector pins for discoloration, buildup, or deformation.

  4. 04

    Actual overheating condition

    Wiring / connection

    In some cases the exhaust temperature genuinely exceeds 250 degrees Fahrenheit due to a blocked exhaust duct or a failed cycling thermostat that allows continuous heating. Check that the exhaust vent system is fully clear and unobstructed before replacing the thermistor.

  5. 05

    Control board fault

    Part replacement

    If the thermistor and all associated wiring test within specification, the control board's thermistor input circuit may have failed, causing it to misread a normal resistance value as a short. This is the least likely cause and should only be considered after all other components are cleared.

See the test procedure for each cause

Frequently asked questions about F3E2

What does F3E2 mean on a Kenmore dryer?
F3E2 indicates that the exhaust thermistor circuit has shorted and the control board is reading a resistance below 500 ohms, which corresponds to a temperature above 250 degrees Fahrenheit. The exhaust thermistor monitors the temperature of air leaving the drum through the exhaust duct. This fault causes the dryer to stop normal operation to prevent potential overheating. The thermistor itself, its wiring, or its connector are the most likely sources of the problem.
Can I reset a Kenmore dryer to clear the F3E2 error code?
Disconnecting power to the dryer for a few minutes may temporarily clear the error code, but F3E2 will return if the underlying thermistor short is still present. The fault is triggered by a hardware condition, specifically a resistance reading below 500 ohms, so the code will reappear as soon as the dryer runs a cycle and the control board reads the sensor again. A proper repair requires diagnosing and correcting the thermistor or wiring fault.
Is it safe to use my Kenmore dryer when it shows F3E2?
It is not recommended to continue running the dryer while F3E2 is active. The exhaust thermistor is a safety-related sensor that helps the dryer regulate heat and detect overtemperature conditions. With a shorted thermistor, the control board cannot accurately monitor exhaust temperature, which means a genuine overheating event could go undetected. Discontinue use until the sensor and its wiring have been inspected and repaired.
How do I fix the F3E2 error code on a Kenmore dryer?
Begin diagnosis with the thermistor circuit test outlined in TEST #4a of the dryer's service documentation, which involves measuring resistance at the thermistor terminals. Check the wiring harness between the thermistor and the control board for pinched or shorted wires, and inspect the connector for corrosion. If the thermistor itself tests below 500 ohms at room temperature, it needs to be replaced. Also verify the exhaust duct is clear, since a genuine airflow restriction can cause real overheating that contributes to sensor damage.
How much does it cost to repair a Kenmore dryer F3E2 error?
If only the exhaust thermistor needs replacement, parts typically cost in the range of $15 to $40 depending on the specific model. If a technician performs the repair, expect total costs including labor to fall in the range of $100 to $200. Wiring harness repairs can vary widely depending on the extent of the damage. A control board replacement, if required, is the most expensive scenario and can range from $150 to $350 or more for parts alone.

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