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Error code reference

Thermador Oven Error Code E104

Upper/single cavity (Cvt 1) temperature sensor shorted.

Thermador codesThermador oven codes
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What the E104 error code actually means

Your Thermador oven is detecting a problem with the temperature sensor inside the oven cavity, specifically that the sensor is sending an incorrect electrical signal caused by a short circuit. This means the oven cannot accurately measure the temperature inside, so it has stopped operating to prevent overheating or unsafe conditions. The sensor or the wiring connected to it will need to be inspected and likely replaced to resolve the issue.

Diagnostic procedure

The full E104 procedure

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First diagnostic step
Refer to Diagram 2/4.
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Most common causes of E104

Ranked by how often they cause this code
  1. 1Failed temperature sensor probe
  2. 2Damaged or pinched wiring harness
  3. 3Corroded or shorted connector terminals
  4. 4Sensor connector not fully seated
  5. 5Faulty control board

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Questions people ask about E104

What does E104 mean on a Thermador oven?
E104 indicates that the temperature sensor for the upper or single oven cavity (Cvt 1) has a short circuit condition. The control board detected an abnormally low resistance reading from the sensor circuit, which prevents the oven from accurately measuring cavity temperature. The oven will not operate normally until the fault is diagnosed and repaired. The first recommended diagnostic step is to consult Diagram 2/4 for the sensor wiring layout.
Is it safe to use my Thermador oven when E104 is displayed?
No, you should not attempt to use the oven while E104 is active. A shorted temperature sensor means the control board cannot accurately monitor cavity temperature, which creates a risk of uncontrolled overheating. Discontinue use until the sensor and its wiring have been inspected and the fault has been resolved.
How much does it cost to repair a Thermador oven with error code E104?
Repair costs vary depending on what component has failed. A replacement temperature sensor probe typically costs in the range of $20 to $80 in parts, while professional labor can add $100 to $200 or more depending on your location and service provider. If the control board is at fault, parts costs can range from $150 to $400 or higher. Getting a diagnostic service call will help pinpoint the exact cause before committing to a repair.
Can I fix the E104 error myself, or do I need a technician?
A knowledgeable DIYer can perform basic diagnostics such as visually inspecting the wiring harness, reseating connectors, and measuring sensor resistance with a multimeter. If the sensor probe itself has failed, replacing it is a manageable repair for someone comfortable working with appliance components. However, if the fault traces back to the control board or involves complex wiring repair, a qualified appliance technician is recommended.
Will resetting the oven clear the E104 error code?
A power reset by disconnecting the oven from its power source for several minutes may temporarily clear the error code, but it will return as soon as the control board re-detects the shorted sensor circuit. A reset does not repair the underlying fault. The sensor, wiring, and connectors must be physically inspected and the defective component replaced to permanently clear E104.

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