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Error code reference

Kenmore Dryer Error Code F3E3

Inlet thermistor is open; temperature drops below 18°F (>245k ohms).

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Inlet thermistor is open; temperature drops below 18°F (>245k 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 F3E3 means on a Kenmore dryer

The F3E3 error code on a Kenmore dryer indicates that the inlet thermistor has gone open circuit. The control board monitors the resistance of the inlet thermistor to track incoming air temperature. When the thermistor resistance climbs above 245k ohms, the board interprets this as an air temperature reading below 18 degrees Fahrenheit, which is outside the expected operating range. An open thermistor cannot provide a valid temperature signal, so the control board flags the fault and typically halts the drying cycle to prevent uncontrolled operation.

The inlet thermistor is a negative temperature coefficient (NTC) resistor, meaning its resistance decreases as temperature rises. Under normal operating conditions the resistance stays well within a range the board recognizes as valid. A reading above 245k ohms almost always points to a broken or disconnected thermistor rather than an actual ambient temperature that low. The most common failure modes are a thermistor that has burned open internally, a wiring harness connector that has pulled loose or corroded at the thermistor terminals, or damaged wiring between the thermistor and the control board.

Diagnosis should follow TEST #4a: Thermistors on page 15 of the service documentation. This test involves disconnecting the thermistor and measuring its resistance directly with a multimeter. If the resistance reads above 245k ohms or shows an open circuit (OL), the thermistor itself is likely defective. If resistance measures within specification, the wiring harness and control board connections should be inspected for continuity faults before condemning any component.

Source: manufacturer service documentation.

Common causes of F3E3

  1. 01

    Failed inlet thermistor

    Part replacement

    The thermistor element itself has burned open internally, causing resistance to exceed 245k ohms. Measuring the thermistor directly with a multimeter will show an open circuit or a reading well above the valid range.

  2. 02

    Loose or disconnected wiring connector

    Wiring / connection

    The connector at the thermistor plug can work loose over time from vibration, breaking the electrical circuit and mimicking an open thermistor. Inspect the connector at the thermistor and at the control board for secure seating.

  3. 03

    Corroded or damaged thermistor terminals

    Wiring / connection

    Moisture or heat can corrode the terminals at the thermistor connector, increasing resistance to the point the board reads an open circuit. Look for discoloration, pitting, or corrosion on the pins and sockets.

  4. 04

    Broken wiring in the harness

    Part replacement

    A wire in the harness between the thermistor and the control board can break internally while still appearing intact externally. A continuity test along each wire in the thermistor circuit will reveal any open wire.

  5. 05

    Faulty control board

    Part replacement

    If the thermistor and all associated wiring test within specification, the control board's thermistor input circuit may have failed. This is the least likely cause and should only be considered after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about F3E3

What does F3E3 mean on a Kenmore dryer?
F3E3 means the inlet thermistor has gone open circuit, registering a resistance above 245k ohms. The control board interprets this as an air temperature below 18 degrees Fahrenheit, which is outside the valid operating range. The dryer stops the cycle because it cannot safely read the incoming air temperature. The thermistor itself, its wiring, or its connectors are the most likely sources of the fault.
Can I fix the F3E3 error code myself?
A knowledgeable DIYer can diagnose and often fix this error by following the thermistor test procedure (TEST #4a, page 15) with a multimeter. You would check the thermistor's resistance and inspect the wiring harness for loose connectors or broken wires. If the thermistor reads open circuit, replacing it is a straightforward repair. If the wiring or control board is involved, the job becomes more complex.
Is it safe to keep using my Kenmore dryer with an F3E3 error?
It is not recommended to continue using the dryer while this fault is active. With a non-functioning inlet thermistor, the control board cannot accurately monitor air temperature conditions, which could allow the dryer to operate outside safe parameters. Address the fault before resuming normal use.
How much does it cost to repair the F3E3 error on a Kenmore dryer?
If only the inlet thermistor needs replacement, parts typically cost in the range of $15 to $50 depending on the model. Professional labor to diagnose and replace the thermistor generally adds $75 to $150. If the control board is at fault, total repair costs can rise significantly, often in the range of $150 to $350 or more including parts and labor.
Will resetting the dryer clear the F3E3 error code?
Resetting the dryer by unplugging it for a few minutes may temporarily clear the error display, but the code will return as soon as the control board checks the thermistor circuit again if the underlying fault is still present. A reset does not fix a failed thermistor or broken wiring. Proper diagnosis using the thermistor test procedure is necessary to resolve the fault permanently.

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