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Error code reference

Bosch Dryer Error Code F:08

Cable break or short-circuit in NTC door sensor.

Bosch codesBosch dryer codes

Cable break or short-circuit in NTC door sensor.

First step from the service manual

Check cable / plug contacts. Start test programme. Replace NTC door.

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

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What F:08 means on a Bosch dryer

The F:08 error code on a Bosch dryer indicates a fault in the NTC door sensor circuit. NTC stands for Negative Temperature Coefficient, meaning the sensor's electrical resistance decreases as temperature increases. This sensor monitors the temperature in the door area of the dryer, providing feedback to the control board. When the control board detects a resistance value outside the expected operating range, either too high (suggesting a cable break or open circuit) or too low (suggesting a short circuit), it triggers the F:08 fault and halts operation to prevent potential overheating or unsafe conditions.

The most common causes of this fault are physical damage to the wiring harness connecting the NTC door sensor to the control board, corroded or loose connector pins at the plug, or a failed NTC sensor itself. The wiring to the door sensor is particularly vulnerable to wear because the dryer door opens and closes repeatedly, putting mechanical stress on the cable over time. A complete wire break will send an out-of-range high resistance signal to the board, while a wiring short will produce an abnormally low resistance reading.

Diagnosis should begin with a thorough visual inspection of the cable routing from the NTC door sensor to its plug and connector on the control board. Check for pinched, frayed, or broken wires, and ensure all plug contacts are fully seated and free of corrosion. Running the built-in test programme can help confirm whether the fault is persistent or intermittent. If the wiring and connectors check out, the NTC door sensor itself should be replaced.

Source: manufacturer service documentation.

Common causes of F:08

  1. 01

    Damaged or broken sensor wiring

    Wiring / connection

    Repeated opening and closing of the dryer door can stress the wiring harness connected to the NTC door sensor, eventually causing a break in the wire. A broken wire creates an open circuit, which the control board reads as an out-of-range resistance value.

  2. 02

    Loose or corroded connector plug

    Wiring / connection

    The plug connecting the NTC sensor cable to the control board or sensor body can work loose over time or develop corrosion on the contacts. This can produce intermittent or permanent open-circuit readings without any actual wire breakage.

  3. 03

    Short circuit in the sensor cable

    Wiring / connection

    If the insulation on the NTC sensor wiring is worn or pinched, two conductors can contact each other, creating a short circuit. This produces an abnormally low resistance signal that the control board flags as a fault.

  4. 04

    Failed NTC door sensor

    Part replacement

    The NTC sensor component itself can fail internally, producing a resistance value outside the acceptable range regardless of wiring condition. If cable and connector checks pass without fault, the sensor should be replaced.

See the test procedure for each cause

Frequently asked questions about F:08

What does F:08 mean on a Bosch dryer?
F:08 indicates a cable break or short circuit in the NTC door sensor circuit. The NTC door sensor monitors temperature near the dryer door and communicates that information to the control board via its resistance value. When the board detects a resistance reading outside the expected range, it triggers F:08 and stops the dryer. The fault points to either the sensor wiring, the connector plug, or the sensor itself.
Can I fix F:08 on a Bosch dryer myself?
A knowledgeable DIYer can begin by inspecting the NTC door sensor cable and plug for visible damage, pinching, or loose connections, which requires no parts and no special tools beyond a screwdriver. If the wiring looks intact, testing the sensor's resistance with a multimeter can confirm whether the sensor has failed internally. Replacing the NTC door sensor is a moderately straightforward repair, but if you are not comfortable working inside appliances, a qualified technician is recommended.
Is it safe to use my Bosch dryer when F:08 is displayed?
No, you should not continue using the dryer while F:08 is active. The NTC door sensor provides temperature data that the control system relies on to prevent overheating. Operating the dryer without a functioning sensor removes an important safety check and could create a fire or overheating hazard. The dryer should remain off until the fault is diagnosed and resolved.
Will resetting the dryer clear the F:08 error?
A power reset may temporarily clear the fault display, but F:08 will return if the underlying problem with the NTC door sensor wiring or the sensor itself has not been repaired. Running the built-in test programme after a reset can help confirm whether the fault is persistent. A permanent fix requires inspecting and repairing the cable, plug contacts, or replacing the NTC door sensor.
How much does it cost to repair a Bosch dryer F:08 error?
If the fix is simply reseating a loose connector or repairing a wire, costs may be limited to a service call fee, typically in the range of $75 to $150 depending on your location. If the NTC door sensor needs replacement, parts and labor combined generally fall in the range of $100 to $250. Costs can vary based on the specific Bosch dryer model, parts availability, and local labor rates.

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