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Error code reference

Thermador Range Error Code 24

Fault code indicated by first LED blinking 2 times followed by second LED blinking 4 times.

Thermador codesThermador range codes

Fault code indicated by first LED blinking 2 times followed by second LED blinking 4 times.

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What 24 means on a Thermador range

Error code 24 on a Thermador range is communicated through a two-part LED blink sequence: the first LED blinks 2 times, pauses, and then the second LED blinks 4 times. This blink pattern is part of Thermador's fault signaling system used on ranges that do not have a traditional alphanumeric display. The sequence is designed to help technicians identify specific fault categories by counting each LED's blink count separately and cross-referencing the combined value with the fault code table.

Because the source data does not specify the exact subsystem tied to code 24, diagnosis should begin with a systematic inspection of the control board, wiring harness connections, and any sensors or switches that feed signals back to the main control. On Thermador ranges, fault codes in this blink-sequence format often relate to communication errors between the main control board and secondary boards, temperature sensor faults, or relay failures on the control board itself.

A technician encountering this code should carefully document when the fault appears, whether it is persistent or intermittent, and whether it coincides with a specific cooking mode or ignition event. Intermittent faults often point to loose connectors or failing sensors, while persistent faults on every power cycle are more likely tied to a failed control board component or a short in the wiring harness. Always disconnect power before inspecting internal components.

Source: manufacturer service documentation.

Common causes of 24

  1. 01

    Control Board Fault

    Part replacement

    A failed or failing main control board can trigger blink-sequence fault codes. Inspect the board for signs of burnt components, damaged traces, or failed relays.

  2. 02

    Loose or Damaged Wiring Harness Connection

    Wiring / connection

    Intermittent or broken connections between the control board and secondary components can produce fault codes. Check all harness connectors for corrosion, looseness, or visible damage.

  3. 03

    Temperature Sensor Failure

    Part replacement

    A faulty oven temperature sensor (RTD probe) can send out-of-range signals to the control board, triggering a fault. Resistance should be measured at the sensor terminals and compared against the specification for the installed sensor.

  4. 04

    Secondary Board Communication Error

    Part replacement

    Thermador ranges often use multiple boards that communicate with each other. A failure in this communication path, caused by a faulty secondary board or a broken data line, can register as a fault code.

  5. 05

    Power Supply Irregularity

    Wiring / connection

    Low or inconsistent voltage supply to the range can cause control boards to log fault codes. Verify that the range is receiving correct voltage at the terminal block before condemning any internal component.

See the test procedure for each cause

Frequently asked questions about 24

What does 24 mean on a Thermador range?
Error code 24 on a Thermador range is indicated by the first LED blinking 2 times followed by the second LED blinking 4 times. This blink sequence is the range's built-in fault signaling system used on models without alphanumeric displays. The code points to an internal fault that requires further diagnosis to identify the specific failed component. Common areas to investigate include the control board, wiring harness, and temperature sensors.
Can I fix error code 24 on my Thermador range myself?
Some causes of error code 24, such as loose wiring harness connectors, can be addressed by a knowledgeable DIYer after disconnecting power to the unit. However, if the fault is traced to the main control board or a secondary board, replacement of those components is typically required and is best handled by a qualified technician. Always shut off power at the breaker before opening the range cabinet.
Is it safe to use my Thermador range when error code 24 is displayed?
It is not recommended to continue using the range while an active fault code is present, as the underlying issue could affect cooking performance or involve an electrical fault. Until the root cause is identified and resolved, the range may not operate as intended. Discontinue use and contact a qualified appliance repair technician for diagnosis.
Will resetting my Thermador range clear error code 24?
Disconnecting power to the range for several minutes and then restoring it may temporarily clear the fault code if the issue was caused by a transient electrical event. However, if the underlying component or wiring fault is still present, the code will return. A reset alone is not a repair and should only be used as an initial diagnostic step to check whether the fault is persistent.
How much does it cost to repair error code 24 on a Thermador range?
Repair costs for error code 24 depend on the root cause identified during diagnosis. Wiring repairs or sensor replacements are generally less expensive, typically ranging from around 100 to 300 dollars including labor. Control board replacement on a Thermador range can range from 300 to 700 dollars or more, depending on the specific model and part cost. Getting a diagnostic service call from a certified technician before authorizing repairs is strongly recommended.

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