Bosch · Oven Serious
E300 — Electronic / Control Board Fault
On Bosch ovens, E300 indicates an electronic/control-board fault (often after a power surge or outage). Power-cycle the oven at the breaker; if E300 returns, the control unit (ECU) needs service. It is not the self-clean door-lock fault — that is E305/F305.
- Keep using it?
- Limited use only
- DIY difficulty
- Moderate
- Verified against
- bosch-home.com ↗
How to fix it
- Power off the oven at the circuit breaker (not just the appliance) and leave it off for about 60 seconds to fully reset the control.
- Restore power and try starting a cycle again.
- If E300 returns, this is not a DIY control-module diagnosis — book service. Bosch is bot-walled for further public verification, so avoid guessing at internal ECU repairs.
Why it happens
Typical signs: E300 shown on the display · Oven controls unresponsive or behaving erratically · Oven will not start a cycle
- Control module (ECU) fault The oven's electronic control unit has registered an internal fault.
- Power surge or outage event A voltage spike or brief power loss can leave the control in a fault state until it's reset.
- Wiring issue to the control module A loose or damaged connection to the control can also trigger this fault.
More Bosch oven codes
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: bosch-home.com.