Thermador Oven Error Code F30

F30 means the upper oven temperature sensor has been detected in a shorted condition. The sensor is a resistance-based probe that the relay board monitors continuously, and when its resistance drops below the valid range, the control triggers this fault code. The oven will not operate normally until the short is identified and corrected.

No, you should not attempt to use the oven while the F30 code is active. The fault indicates the control board cannot accurately read the upper oven temperature, which means the oven cannot regulate heat safely. Continued use risks uncontrolled heating. Power off the oven until the fault has been diagnosed and repaired.

Repair costs vary depending on what has failed. A replacement upper oven temperature sensor typically falls in the range of $25 to $80 for the part alone. If a wiring harness or relay board component is also involved, total repair costs including labor can range from $150 to $400 or more. Getting a diagnostic visit from a certified technician will provide a more accurate estimate for your specific situation.

A knowledgeable DIYer can start by inspecting the sensor wiring and the connector at pin header P3 on the relay board for visible damage, pinching, or corrosion. Resistance testing of the sensor with a multimeter is also a straightforward step. However, if the relay board itself is involved or wiring replacement is needed inside the oven cavity, professional repair is recommended to ensure safety and proper reassembly.

Resetting the oven by cycling power may temporarily clear the display, but the F30 code will return as soon as the control board re-reads the shorted sensor signal. A reset does not address the underlying short circuit in the sensor or wiring. A lasting repair requires finding and correcting the cause of the short.