Bosch Oven Error E120

DIY Fix Basic Oven Reset and Cooling

1. Turn the oven off and allow it to cool completely.
2. Switch off power at the circuit breaker or unplug for several minutes to perform a reset.
3. After reconnecting power, attempt to run the oven again to see whether the error persists.

Technician Only Inspect Temperature Sensor and Control Board

1. Disconnect power to the oven.
2. Access and visually inspect the internal temperature sensor for damage, loose connection, or disconnection.
3. Use a multimeter to measure the temperature sensor resistance if model‑specific values are available.
4. Inspect control board connections to the sensor.
5. Replace the sensor if readings are out of specification or connector damage is found.
6. If sensor and wiring appear correct but error persists, perform diagnostics on the control board and replace if necessary.

Parts needed: Temperature sensor, Control board