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Error code reference

GE Dryer Error Code F04

Outlet thermistor open circuit.

GE codesGE dryer codes

Outlet thermistor open circuit.

First step from the service manual

If temperature is less than 36°F replace thermistor or review connection; if temperature greater than or equal to 36°F clear fault.

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

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What F04 means on a GE dryer

The F04 error code on a GE dryer indicates an open circuit condition in the outlet thermistor. The outlet thermistor is a temperature-sensing component that monitors the air temperature at the exhaust of the dryer drum. It sends resistance-based signals to the control board so the dryer can regulate heat output during a cycle. An open circuit means the electrical path through the thermistor has been broken completely, preventing any valid temperature reading from reaching the control board.

The diagnostic procedure for F04 is temperature-dependent. If the ambient or sensed temperature is below 36°F, the fault is treated as a genuine component or wiring failure, and the thermistor or its connection should be inspected and replaced as needed. At or above 36°F, an open circuit reading is not expected under normal conditions, but the fault can sometimes be cleared without part replacement, suggesting the fault may have been triggered by a transient electrical event or a loose connection that has since self-corrected.

Common causes include a failed thermistor, which loses continuity internally, corroded or disconnected wiring harness connectors at the thermistor terminals, and damaged wiring along the harness run. Because the thermistor operates on resistance values, even a partially degraded connector can present as an open circuit to the control board. Technicians should inspect the connector pins for corrosion, verify continuity through the wiring harness, and test the thermistor itself with a multimeter before condemning any single component.

Source: manufacturer service documentation.

Common causes of F04

  1. 01

    Failed outlet thermistor

    Part replacement

    The thermistor itself has developed an open circuit internally, meaning it no longer conducts electricity and cannot send temperature data to the control board. This is the most common cause, especially in older units, and the thermistor must be replaced.

  2. 02

    Loose or disconnected wiring connector

    Wiring / connection

    The connector linking the thermistor to the wiring harness may have vibrated loose or pulled off the thermistor terminals. Inspect the connector at the thermistor and reseat it firmly to restore the circuit.

  3. 03

    Corroded thermistor connector pins

    Wiring / connection

    Moisture exposure can corrode the metal terminals inside the thermistor connector, increasing resistance to the point where the control board reads the circuit as open. Clean or replace the connector if corrosion is present.

  4. 04

    Damaged wiring harness

    Part replacement

    The wiring between the thermistor and the control board may have been pinched, cut, or burned, breaking continuity in the circuit. Use a multimeter to check for continuity along the full harness run to identify any break.

  5. 05

    Transient electrical fault

    Wiring / connection

    At temperatures at or above 36°F, an open circuit reading may result from a brief electrical disturbance rather than a component failure. Clearing the fault code and running a test cycle may resolve the issue without any part replacement.

See the test procedure for each cause

Frequently asked questions about F04

What does F04 mean on a GE dryer?
F04 on a GE dryer means the control board has detected an open circuit in the outlet thermistor, the sensor that monitors exhaust air temperature. With no valid signal from this sensor, the dryer cannot properly regulate heat and displays the fault to alert the user. Depending on the ambient temperature when the fault occurred, the fix may be as simple as clearing the code or as involved as replacing the thermistor.
Can I fix the F04 error code myself?
In many cases, yes. Start by checking whether the wiring connector at the outlet thermistor is securely attached and free of corrosion. If the fault occurred in temperatures at or above 36°F, clearing the fault and running a test cycle may be all that is needed. If the temperature was below 36°F or the fault returns, the thermistor should be tested with a multimeter and replaced if it shows no continuity.
Is it safe to run my GE dryer with an F04 error?
It is not recommended. The outlet thermistor is part of the dryer's thermal protection system, and operating without a working temperature sensor could prevent the dryer from detecting an overheating condition. Resolve the F04 fault before continuing regular use to avoid potential safety issues.
How much does it cost to repair an F04 error on a GE dryer?
If only the thermistor needs to be replaced, parts typically range from around $15 to $40 depending on the model. If you hire a technician, expect total repair costs in the range of $75 to $200 when accounting for the service call, labor, and the part. Repairs involving harness damage or control board issues could push costs higher.
Will resetting my GE dryer clear the F04 error code?
A reset may clear the F04 code temporarily, and at temperatures at or above 36°F the fault is sometimes caused by a transient event that does not repeat. However, if the thermistor has actually failed or if there is a wiring problem, the fault will return. Always inspect the thermistor and its connections after clearing the code to confirm the underlying cause has been addressed.

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