Thermador Oven Error Code E012 — Temperature Sensor (RTD) Open Circuit
What this means
Error E012 on Thermador ovens indicates the temperature sensor (RTD probe) wire is broken, disconnected, or the sensor element itself has failed open. The control board sends a small current through the sensor and expects a resistance reading back. An open circuit (infinite resistance) means no signal is returning. The oven cannot regulate temperature and will not allow heating. This is a very common code after self-clean cycles, which subject the sensor to extreme heat.
Alternate codes: E12, E0-12
Step-by-step fix
3 stepsCheck the sensor wire harness connection
Turn off the oven breaker. Access the sensor wire harness connector — typically behind the oven or through an access panel. Disconnect and reconnect the connector firmly. Check for any burned or broken wires.
A common cause is simply a connector that has vibrated loose over time, especially on Thermador slide-in ranges.
Test the sensor with a multimeter
Disconnect the sensor from the harness. Measure resistance across the two sensor leads. At room temperature, expect about 1080–1100 ohms. An OL (open / infinity) reading confirms the sensor element has broken internally.
If the reading is correct at room temperature but E012 only appears during heating, the sensor may have an intermittent open that only manifests at high temperatures. Replace it regardless.
Replace the sensor
Unscrew the sensor from inside the oven cavity. Pull the probe out gently. Install the new sensor probe, secure it, reconnect the harness, and restore power. Run a bake cycle at 350°F to verify normal operation.
Thermador sensors are a straightforward replacement — one of the simplest oven repairs you can do yourself.
When to call a professional
If the new sensor also reads open, the wire harness has a break somewhere between the connector and the control board. A technician can locate and repair the wire break.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
Oven Temperature Sensor (RTD Probe)
Part #00492425 · $20–$40
Required if sensor reads open circuit (OL)
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