Thermador Range Error Code F3

F3 on a Thermador range signals that the oven temperature sensor has been detected as either open (broken circuit) or shorted (collapsed circuit) for 16 seconds or more. This prevents the control board from reading oven temperature accurately. The fault points to the sensor probe, its wiring harness, or in some cases the ERC3 control board.

Resetting the range by cycling the power may temporarily clear the F3 code, but it will return if the underlying problem is not corrected. Because the fault requires 16 seconds of continuous abnormal sensor readings to trigger, a brief reset does not fix a failed sensor or damaged wire. A permanent fix requires diagnosing and repairing the root cause.

Repair costs depend on which component has failed. A replacement oven temperature sensor typically costs in the range of $20 to $80 for the part. If the ERC3 control board requires replacement, parts alone can run from $150 to $400 or more depending on the model. Adding professional labor will increase the total, generally putting a full-service repair between $100 and $500 depending on the diagnosis.

Many F3 errors can be resolved without professional help. Start by checking that all wiring connectors to the sensor are firmly seated and that no wires are pinched. Then use a multimeter to check the sensor resistance, which should read approximately 1000 ohms at room temperature. If the sensor reads far outside that value, replacing it is a straightforward repair for someone comfortable with basic appliance disassembly.

You should not attempt to use the oven while F3 is active. The error means the control board cannot monitor oven temperature, which removes a critical safety and accuracy function. Operating the oven without a working temperature sensor risks overheating and potential damage to the range or surrounding cabinetry. The stovetop burners may still operate normally, but oven use should be avoided until the fault is resolved.