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Error code reference

Thermador Range Error Code d:06

WFMC motor control

Thermador codesThermador range codes

WFMC motor control: NTC relay failure (NTC too hot or relay stuck closed).

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  • Step-by-step tests with expected resistance, voltage, and continuity values
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What d:06 means on a Thermador range

The d:06 error code on a Thermador range indicates a fault within the WFMC (warming function motor control) motor control module, specifically involving the NTC (negative temperature coefficient) relay circuit. This fault is triggered under two distinct conditions: either the NTC thermistor is reporting an excessively high temperature reading, or the relay associated with the NTC circuit has become stuck in the closed position. The NTC thermistor is a temperature-sensing resistor whose resistance decreases as temperature rises, and the motor control module continuously monitors this signal to regulate thermal conditions safely.

When the NTC reads an abnormally high temperature, the control interprets this as a potential thermal overload condition and shuts down operation to prevent damage. Alternatively, if the relay becomes stuck closed, current continues to flow through the circuit even when the control logic has commanded it to open, which represents both a functional failure and a potential safety concern. In either case, the motor control board cannot confirm proper circuit behavior and raises the d:06 fault.

Diagnosing this error requires inspection of the NTC thermistor for correct resistance values across a known temperature range, as well as evaluation of the relay on the motor control board for proper switching operation. A relay stuck closed will typically not respond to command signals from the control logic. If the thermistor is reading incorrectly or the relay has failed mechanically or electrically, component replacement is required. In many cases, the motor control board itself must be replaced as the relay is integrated into the board assembly.

Source: manufacturer service documentation.

Common causes of d:06

  1. 01

    Failed NTC thermistor

    Part replacement

    The NTC thermistor may have drifted out of its correct resistance range or failed completely, causing the motor control module to read an abnormally high temperature. Testing the thermistor with a multimeter across a known temperature range will confirm whether it is producing accurate resistance readings.

  2. 02

    Relay stuck closed on the motor control board

    Part replacement

    The relay integrated into the WFMC motor control board can fail mechanically, remaining in the closed position even when the control logic commands it to open. This is identifiable if the circuit remains energized when it should not be, and typically requires full motor control board replacement.

  3. 03

    Motor control board internal failure

    Part replacement

    The motor control module itself may have suffered internal electrical damage affecting the NTC monitoring circuit or relay driver logic. If the thermistor tests within spec but the fault persists, the board is the likely culprit.

  4. 04

    Wiring or connector fault in the NTC circuit

    Wiring / connection

    Damaged, corroded, or loose wiring between the NTC thermistor and the motor control board can produce erroneous temperature signals that trigger this fault. Inspect all connectors and harness segments in the NTC circuit for continuity and secure seating.

  5. 05

    Actual thermal overload condition

    Wiring / connection

    If ventilation around the motor control area is blocked or a cooling fan has failed, genuine overheating can drive the NTC reading high enough to trigger d:06. Check for obstructions and confirm any associated cooling fans are operating correctly.

See the test procedure for each cause

Frequently asked questions about d:06

What does d:06 mean on a Thermador range?
The d:06 code indicates a fault in the WFMC motor control module involving the NTC relay circuit. It activates when the NTC thermistor reports an excessively high temperature or when the associated relay is detected as stuck in the closed position. Both conditions prevent the motor control from operating safely, so the range shuts down and displays the fault. A technician will need to test the thermistor and relay to determine which component has failed.
Can I fix a d:06 error on my Thermador range myself?
Some preliminary checks, such as inspecting wiring connectors and verifying there are no ventilation obstructions, can be performed without specialized tools. However, accurately testing the NTC thermistor resistance and evaluating relay function on the motor control board requires a multimeter and familiarity with appliance electrical systems. If the motor control board itself has failed, replacement involves working with line voltage components, which carries serious safety risks and is best handled by a qualified technician.
Is it safe to use my Thermador range while d:06 is displayed?
A d:06 fault indicates a potential thermal or relay control failure inside the motor control module, which can pose a safety risk if the range is operated. A stuck-closed relay in particular means a circuit may remain energized when it should not be. It is strongly recommended to stop using the range and unplug it or disconnect the circuit breaker until the fault is properly diagnosed and repaired.
How much does it cost to repair a d:06 error on a Thermador range?
Repair costs vary depending on which component has failed. If only the NTC thermistor requires replacement, costs are generally lower, typically in the range of $100 to $250 including parts and labor. If the full WFMC motor control board needs to be replaced, costs can range from $300 to $600 or more depending on parts pricing and labor rates in your area. Obtaining a diagnostic visit from a certified technician will give you an accurate estimate for your specific situation.
Will resetting my Thermador range clear the d:06 error code?
Power cycling the range by unplugging it or turning off the circuit breaker for several minutes may temporarily clear the d:06 code, but if the underlying fault in the NTC thermistor or relay has not been resolved, the error will return during operation. A reset does not repair a failed component. The fault should be properly diagnosed and the defective part replaced to achieve a lasting repair.

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