Bosch Range Error Code E303

E303 means the temperature sensor on the control module detected that the electronics compartment temperature rose too quickly over time, exceeding the programmed limit. The control responds by shutting off all heating elements and running the cooling fan at high speed to protect the control electronics. This is a thermal protection fault specific to the electronics bay, not the oven cavity itself.

No. When E303 is active, the range has already disabled the heating elements as a protective measure. Attempting to bypass this condition or continue cooking before the underlying cause is resolved could result in damage to the control board or a potential safety hazard. The range should remain out of service until the fault is diagnosed and corrected.

Repair costs vary depending on the failed component. A replacement cooling fan motor typically falls in the range of $50 to $150 for the part alone. A new control module can range from $150 to $400 or more depending on the model. Labor costs from an appliance technician typically add $100 to $200 depending on your region and the complexity of the repair.

Some causes of E303 are DIY-accessible, such as clearing blocked ventilation trims or reseating loose wiring connectors at the fan and control module. However, diagnosing a stuck relay, a failed cooling fan motor, or a faulty heating element typically requires a multimeter and comfort working inside the appliance. If you are not experienced with appliance electrical systems, a qualified technician is recommended.

A power reset by turning off the circuit breaker for several minutes may clear the fault temporarily if the electronics have cooled down, but E303 will return if the root cause is not addressed. A reset should be used only as part of diagnostics, not as a fix. Persistent or recurring E303 codes indicate a component issue that requires repair.