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Error code reference

Thermador Range Error Code E:17

WTMC dryer

Thermador codesThermador range codes

WTMC dryer: NTC error (NTC R3 at lint screen).

First step from the service manual

Check NTC R3 and wire harness. Replace faulty part.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What E:17 means on a Thermador range

The E:17 error code on a Thermador WTMC dryer indicates a fault with NTC sensor R3, which is positioned at the lint screen area of the appliance. NTC stands for Negative Temperature Coefficient, referring to a thermistor whose electrical resistance decreases predictably as temperature increases. The control board monitors R3 continuously to track temperatures at the lint screen location, and when the resistance reading falls outside the expected range, either due to an open circuit, short circuit, or a value that does not correspond to any valid temperature, the board flags this error and interrupts normal operation.

The most direct causes of an E:17 fault involve the NTC sensor R3 itself or the wire harness connecting it to the control board. A failed thermistor can present as an open circuit with extremely high or infinite resistance, or as a short with near-zero resistance, neither of which maps to a legitimate temperature reading. Wiring issues such as a broken conductor, corroded connector pin, or chafed insulation causing an intermittent short can produce the same fault signal even when the sensor itself is functional.

Diagnosing this error requires inspecting the wire harness from R3 to the control board for visible damage, loose connections, or corrosion, then measuring the resistance of NTC R3 directly with a multimeter. A properly functioning NTC thermistor will show a specific resistance value corresponding to ambient temperature. If the harness checks out and the sensor reads open or shorted, replacing R3 is the indicated repair. If resistance is within a normal range but the error persists, the control board input circuit may be at fault.

Source: manufacturer service documentation.

Common causes of E:17

  1. 01

    Failed NTC R3 thermistor

    Part replacement

    The NTC sensor itself has failed internally, presenting either an open circuit or a short circuit that the control board cannot interpret as a valid temperature. Measuring the sensor with a multimeter will show a resistance value outside the normal operating range.

  2. 02

    Damaged or broken wire harness

    Part replacement

    The wiring connecting NTC R3 to the control board may have a broken conductor, chafed insulation, or a loose connector causing an intermittent or permanent open circuit. A visual inspection and continuity test of the harness will identify this fault.

  3. 03

    Corroded or loose connector pins

    Wiring / connection

    Moisture or heat cycling can corrode the connector pins at the R3 sensor or at the control board end of the harness, increasing resistance in the circuit and triggering the error. Inspect connectors closely for discoloration, oxidation, or pins that are not fully seated.

  4. 04

    Lint or debris contamination at the sensor

    Wiring / connection

    Excessive lint accumulation around the R3 sensor location near the lint screen can insulate the thermistor or physically damage the sensor over time. Cleaning the lint screen area thoroughly and inspecting the sensor for physical damage is a recommended early step.

  5. 05

    Control board input circuit fault

    Part replacement

    If the NTC R3 sensor and the entire wire harness test within normal specifications but the error persists, the input circuit on the control board that reads the sensor signal may be damaged. This is less common but should be considered after all other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about E:17

What does E:17 mean on a Thermador range?
The E:17 code on a Thermador WTMC dryer indicates an NTC sensor error specifically involving sensor R3, which is located at the lint screen area. The control board has detected a resistance reading from this thermistor that does not correspond to any valid temperature, meaning the sensor or its wiring circuit has a fault. The appliance will not operate normally until the issue is resolved.
Can I fix an E:17 error on my Thermador dryer myself?
A knowledgeable DIYer with a multimeter can inspect the wire harness for visible damage and test the continuity and resistance of NTC R3 at the lint screen location. If the sensor reads open or shorted compared to expected NTC values at room temperature, replacing it is a straightforward repair. However, if the wiring and sensor both test correctly, diagnosing a potential control board fault is best left to a qualified technician.
Is it safe to continue using my dryer when E:17 is displayed?
It is not recommended to continue operating the dryer while the E:17 error is active. The NTC R3 sensor at the lint screen is part of the thermal monitoring system, and without accurate temperature readings in that area, the appliance cannot properly manage heat levels. Continued use without a functioning temperature sensor could create unsafe operating conditions.
Will resetting the dryer clear the E:17 error code?
A power reset may temporarily clear the error display, but the E:17 code will return if the underlying fault with NTC R3 or its wire harness has not been corrected. Because the control board checks the sensor continuously during operation, a failed or out-of-range sensor will trigger the code again as soon as the appliance attempts to run. A proper repair of the sensor or wiring is required for a permanent fix.
How much does it cost to repair an E:17 error on a Thermador dryer?
Repair costs vary depending on whether the fault is the NTC R3 sensor, the wire harness, or a control board. An NTC thermistor is generally an inexpensive component, with parts costs typically in the range of $15 to $60, while professional labor for diagnosis and replacement can add $100 to $250 or more depending on your location and service provider. A control board replacement would be significantly more expensive, often ranging from $200 to $500 or higher for parts alone.

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