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Error code reference

Kenmore Dryer Error Code F3E1

Exhaust thermistor is open; temperature drops below 18°F (>50k ohms).

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Exhaust thermistor is open; temperature drops below 18°F (>50k 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 F3E1 means on a Kenmore dryer

The F3E1 error code on a Kenmore dryer indicates that the exhaust thermistor circuit has opened, meaning the control board is reading an extremely high resistance value above 50,000 ohms. This condition corresponds to a sensed temperature below 18 degrees Fahrenheit, which is physically implausible during dryer operation and signals a fault in the thermistor or its wiring rather than an actual temperature reading. The exhaust thermistor is a negative temperature coefficient (NTC) sensor positioned in the exhaust airflow path, and its resistance drops as temperature rises. When the circuit reads above 50k ohms, the control board interprets this as a broken or disconnected sensor and triggers the F3E1 fault to prevent unsafe operation.

The most direct cause of this fault is a failed exhaust thermistor, where the internal sensing element has physically broken and created an open circuit. However, wiring problems such as a disconnected connector, a broken wire in the harness, or corroded terminals at the thermistor plug can produce identical resistance readings. The control board itself can also be responsible if the thermistor input circuit has failed internally, though this is less common.

Diagnosis should begin with TEST #4a: Thermistors, referenced on page 15 of the technical service documentation for this unit. This test walks through measuring resistance at the thermistor and tracing the circuit back toward the control board to isolate whether the fault lies in the sensor itself, the connecting wiring harness, or the board. Using a multimeter to confirm resistance above 50k ohms at the thermistor connector will confirm an open sensor, while normal resistance at the component but an open reading at the board points toward a wiring or connector issue.

Source: manufacturer service documentation.

Common causes of F3E1

  1. 01

    Failed exhaust thermistor

    Part replacement

    The thermistor's internal sensing element has broken open, causing resistance to exceed 50k ohms. Confirm by measuring resistance directly at the thermistor terminals with a multimeter.

  2. 02

    Disconnected or loose wiring connector

    Wiring / connection

    The connector at the thermistor plug may have vibrated loose or been accidentally dislodged. Visually inspect and reseat all connectors in the thermistor circuit.

  3. 03

    Broken or damaged wire in the harness

    Part replacement

    A wire in the thermistor harness may have chafed, pinched, or broken internally while appearing intact externally. Check continuity along each wire in the circuit with a multimeter.

  4. 04

    Corroded thermistor connector terminals

    Wiring / connection

    Moisture or heat cycling can cause corrosion at the thermistor connector pins, increasing resistance to the point of triggering an open-circuit fault. Inspect terminals for discoloration or oxidation and clean or replace as needed.

  5. 05

    Faulty control board

    Part replacement

    If the thermistor and all wiring test within normal resistance ranges, the thermistor input circuit on the control board may have failed. This is the least likely cause and should only be considered after the sensor and wiring are confirmed good.

See the test procedure for each cause

Frequently asked questions about F3E1

What does F3E1 mean on a Kenmore dryer?
F3E1 indicates that the exhaust thermistor circuit is open, with the control board detecting a resistance above 50,000 ohms. This corresponds to a sensed temperature below 18 degrees Fahrenheit, which signals a broken or disconnected sensor rather than an actual temperature reading. The dryer triggers this code to prevent operating without reliable exhaust temperature monitoring. The fault is most commonly caused by a failed thermistor or a wiring problem in the sensor circuit.
Can I fix the F3E1 error myself on a Kenmore dryer?
A knowledgeable DIYer can diagnose and resolve this error by following the thermistor test procedure outlined in the technical documentation, specifically TEST #4a. You will need a multimeter to measure resistance at the thermistor and along the wiring harness. Replacing the thermistor is a straightforward repair if the sensor tests open, though a wiring repair requires more experience with harness work.
Is it safe to run my Kenmore dryer with an F3E1 error code?
Running the dryer while the exhaust thermistor is faulted is not recommended. The thermistor monitors exhaust air temperature, and without a functioning sensor the control board cannot detect overheating conditions in the exhaust path. Operating the dryer in this state could mask a developing thermal issue and increases the risk of heat-related damage.
How much does it cost to repair a Kenmore dryer F3E1 error?
If the repair only requires a replacement exhaust thermistor, parts typically cost in the range of $15 to $40 depending on the specific model. If the control board is the root cause, board replacement can range from $80 to $200 or more for parts alone. Adding professional labor, total repair costs generally fall between $100 and $300 depending on which component has failed.
Will resetting my Kenmore dryer clear the F3E1 error code?
A power reset may temporarily clear the F3E1 code from the display, but the fault will return as soon as the control board attempts to read the thermistor again and detects the open circuit. Clearing the code without repairing the underlying cause does not resolve the problem. A proper fix requires diagnosing and replacing the failed thermistor or repairing the wiring fault in the sensor circuit.

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