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Error code reference

Bosch Dryer Error Code E:08

Drum temperature NTC defective

Bosch codesBosch dryer codes

Drum temperature NTC defective - drying tunnel inlet NTC error (Error).

First step from the service manual

Check NTC wire harness and connectors.

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

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What E:08 means on a Bosch dryer

The E:08 error code on a Bosch dryer indicates a fault with the drum temperature NTC (Negative Temperature Coefficient) sensor, specifically the inlet NTC located at the drying tunnel entrance. This thermistor is responsible for continuously monitoring the air temperature entering the drum. The control board uses this real-time temperature data to regulate heating cycles and protect the dryer from overheating. When the sensor's resistance readings fall outside the expected range, or the signal is lost entirely, the board flags an E:08 fault and may halt operation.

NTC sensors function by changing electrical resistance in response to temperature. A healthy NTC will show predictable, graduated resistance drops as temperature rises. A defective sensor may produce a short circuit reading (near zero ohms), an open circuit reading (infinite resistance), or erratic fluctuations that the control board cannot interpret. All three conditions will trigger E:08. The fault can originate in the sensor itself or anywhere along the wire harness and connector path between the sensor and the control board.

The first diagnostic step is to inspect the NTC wire harness and all connectors between the drying tunnel inlet sensor and the main control board. Look for damaged insulation, pinched wires, corroded connector pins, or loose terminals. If the wiring checks out, measure the sensor's resistance directly with a multimeter and compare against the specification for the drum inlet NTC. A failed sensor requires physical replacement to resolve the fault.

Source: manufacturer service documentation.

Common causes of E:08

  1. 01

    Damaged or disconnected wire harness

    Wiring / connection

    The wiring between the drying tunnel inlet NTC and the control board can become pinched, frayed, or disconnected over time. Inspect the full harness run and all connectors for visible damage, corrosion, or looseness.

  2. 02

    Failed NTC sensor (open or short circuit)

    Part replacement

    The inlet NTC thermistor itself may have developed an internal open circuit or short circuit, producing a resistance reading outside the acceptable range. Testing with a multimeter will confirm if the sensor has failed.

  3. 03

    Corroded or oxidized connector pins

    Wiring / connection

    Moisture and heat cycling can cause the connector pins at the NTC plug to oxidize, increasing resistance in the circuit and causing intermittent or persistent E:08 faults. Clean or replace the affected connector.

  4. 04

    Intermittent sensor fault from heat stress

    Part replacement

    Repeated thermal cycling inside the dryer can degrade the NTC sensor gradually, causing it to read correctly when cold but fail once the dryer reaches operating temperature. This intermittent behavior still triggers E:08.

  5. 05

    Control board connection fault

    Wiring / connection

    If the harness and sensor both test correctly, the issue may be at the control board terminal where the NTC circuit connects. Check the board-side connector for burn marks, loose pins, or damaged solder joints.

See the test procedure for each cause

Frequently asked questions about E:08

What does E:08 mean on a Bosch dryer?
E:08 indicates that the drum temperature NTC sensor at the drying tunnel inlet has been detected as defective by the control board. This sensor monitors the air temperature entering the drum and is critical for safe heating regulation. The fault can be caused by a failed sensor, damaged wiring, or a poor electrical connection along the harness. The dryer will typically stop normal operation until the fault is resolved.
Can I fix E:08 on my Bosch dryer myself?
A knowledgeable DIYer can attempt this repair by first inspecting the NTC wire harness and connectors for visible damage or loose connections, as these are the most common causes. If the wiring looks intact, testing the NTC sensor's resistance with a multimeter will confirm whether the sensor itself has failed. Replacing the drying tunnel inlet NTC is a straightforward component swap once the dryer is safely unplugged and disassembled. If the wiring and sensor both test correctly, a control board issue may be involved, which is more complex to diagnose.
Is it safe to keep using my Bosch dryer when E:08 is displayed?
Running the dryer with an active E:08 fault is not recommended. The inlet NTC sensor is part of the thermal control system, and without accurate temperature data, the dryer cannot regulate heat properly. This could lead to overheating or inadequate drying performance. It is best to stop using the dryer until the sensor fault is diagnosed and corrected.
Will resetting the dryer clear the E:08 error code?
A power reset may temporarily clear the E:08 code, but if the underlying fault is still present, the error will return once the dryer runs again and the control board re-checks the NTC circuit. A reset does not repair a failed sensor or damaged wiring. A lasting fix requires physically inspecting and correcting the root cause of the fault.
How much does it cost to repair a Bosch dryer E:08 error?
Repair costs vary depending on whether the issue is a wiring or connector problem versus a failed NTC sensor. If only the wire harness or connectors need attention, costs may be minimal, primarily for labor if a technician is involved. If the NTC sensor itself needs replacement, parts typically range from around $15 to $60 depending on the specific model, plus any applicable labor costs. A service call from a technician to diagnose and repair this fault generally ranges from $100 to $250 in total.

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