Bosch Range Error Code E101

Error code E101 on a Bosch range indicates an open circuit condition in the Cavity 1 temperature sensor circuit. An open circuit means the control module is not receiving a valid signal from the oven cavity temperature sensor, either because the sensor itself has failed internally or because the electrical connection between the sensor and the control board has been interrupted. When this fault is detected, the oven responds immediately by shutting down all heating elements in Cavity 1 and running the cooling fan at high speed to protect internal components from any residual heat buildup.

The temperature sensor in the oven cavity is a resistive device, meaning the control module monitors temperature by reading the sensor's electrical resistance. As the oven heats up, the resistance value of the sensor changes in a predictable way, and the control uses this data to regulate heating cycles. An open circuit condition means the resistance reading has gone beyond the expected range, typically toward infinite resistance, which prevents the control from accurately reading or regulating temperature. This can result from a broken sensor element, corroded or loose terminal connections at the sensor or the control board, or damaged wiring along the sensor harness.

Diagnosing E101 starts with a physical inspection of all wiring and connectors running from the sensor to the control module, looking for loose pins, heat damage, or corrosion. After confirming the connections are secure, the sensor itself should be tested with a multimeter to measure its resistance at room temperature. If the resistance value falls within the sensor's specified range and the wiring is intact, the fault likely points to a failed control module rather than the sensor. If the sensor reads out of range or shows no continuity, replacing the sensor is the appropriate next step.