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Error code reference

Thermador Range Error Code 10

WFK 2401 washer

Thermador codesThermador range codes

WFK 2401 washer: NTC failed (shorted).

First step from the service manual

Disconnect NTC and measure resistance at terminals (~5.4-6.5 k-ohms at 20°C/68°F). Replace NTC if faulty.

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

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What 10 means on a Thermador range

Error code 10 on a Thermador range indicates a failed NTC (Negative Temperature Coefficient) thermistor that has developed an internal short circuit. The NTC is a temperature-sensing resistor whose resistance decreases predictably as temperature increases. The control board monitors this resistance to determine the current temperature of the wash or heating system. When the NTC shorts internally, it presents abnormally low resistance to the control board, which interprets this as an implausible temperature reading and triggers the fault code to prevent unsafe operation.

The NTC thermistor in this application should measure approximately 5.4 to 6.5 k-ohms at room temperature (20 degrees C / 68 degrees F). A shorted NTC will read significantly below this range, often near zero ohms, because the internal resistance element has failed and created a direct conductive path. This is distinct from an open-circuit NTC failure, where resistance would read infinitely high. A shorted condition typically results from heat damage, moisture ingress into the sensor body, or age-related degradation of the thermistor material itself.

Diagnosing this fault requires disconnecting the NTC connector from the control harness and measuring resistance across the sensor terminals with a digital multimeter set to the k-ohm range. A reading well below 5.4 k-ohms at room temperature confirms a faulty sensor. If the resistance falls within the specified range, the wiring harness or the control board input circuit should be inspected for a short to ground or a wiring fault before condemning the NTC.

Source: manufacturer service documentation.

Common causes of 10

  1. 01

    Shorted NTC thermistor

    Part replacement

    The thermistor itself has failed internally, creating a short circuit. This is confirmed by measuring resistance at the sensor terminals and finding a reading well below the 5.4 to 6.5 k-ohm specification at room temperature.

  2. 02

    Moisture or liquid ingress into the sensor

    Part replacement

    Water or cleaning fluids can penetrate the sensor housing, causing a conductive short across the internal resistance element. Inspect the sensor body and connector for corrosion, discoloration, or moisture deposits.

  3. 03

    Wiring harness short to ground

    Wiring / connection

    A pinched, chafed, or heat-damaged wire in the NTC circuit can create a short that mimics a failed sensor. Inspect the full length of the NTC wiring harness for visible damage before replacing the sensor.

  4. 04

    Corroded or damaged connector terminals

    Wiring / connection

    Corrosion or physical damage at the NTC connector pins can bridge the terminals and create a false short reading. Clean or replace the connector if corrosion is present.

  5. 05

    Faulty control board input circuit

    Part replacement

    If the NTC measures correctly when disconnected but the error persists, the input circuit on the control board itself may be shorted. This is the least common cause and should be investigated only after the sensor and wiring are ruled out.

See the test procedure for each cause

Frequently asked questions about 10

What does 10 mean on a Thermador range?
Error code 10 indicates that the NTC temperature sensor has failed in a shorted condition. The control board detected abnormally low resistance from the sensor, which prevents it from accurately reading temperature. The appliance will not operate normally until the fault is resolved. Testing the sensor resistance and replacing it if it falls outside the 5.4 to 6.5 k-ohm range at room temperature is the correct first step.
Can I fix error code 10 on my Thermador range myself?
A knowledgeable DIYer comfortable with a multimeter can perform the resistance test on the NTC sensor by disconnecting it from the wiring harness and measuring across its terminals. If the reading is outside the 5.4 to 6.5 k-ohm range at approximately 20 degrees C (68 degrees F), replacing the sensor is straightforward. However, if the sensor tests correctly and the fault points to the wiring harness or control board, professional diagnosis is recommended.
Is it safe to use my Thermador range while error code 10 is active?
It is not advisable to operate the appliance while error code 10 is active. The control board cannot accurately monitor temperature without a functioning NTC sensor, which means it cannot regulate heating properly or protect against overheating conditions. Continuing to use the range in this state could pose a safety risk or cause additional component damage.
How much does it cost to repair error code 10 on a Thermador range?
If the NTC thermistor itself is the failed component, parts and labor costs are typically in the range of $100 to $250 depending on the technician's rates and part availability. If the fault turns out to involve the control board, repair costs can rise considerably, often falling in the $300 to $600 range or higher. Getting a diagnostic visit from a certified technician first will clarify which component needs replacement.
Will resetting the Thermador range clear error code 10?
A power reset by disconnecting the appliance from power for several minutes may temporarily clear the error code from the display, but it will not resolve the underlying hardware fault. If the NTC thermistor is genuinely shorted, the code will return as soon as the control board performs its sensor check at the next startup. Permanent resolution requires testing and replacing the faulty component.

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