Microwave displays E12 and may randomly reset or lose clock settings.

Safety: Unplug the microwave before moving or inspecting the cord.

• Check outlet and circuit: Ensure the Bosch microwave is plugged directly into a properly grounded wall outlet, not a power strip or extension cord. Avoid sharing the circuit with high-draw appliances (toaster, kettle, etc.).
• Inspect power cord: Look for cuts, kinks, or burn marks on the cord and plug. If damaged, stop using the microwave and have the cord replaced by a technician.
• Test another outlet: If possible, plug the microwave into a different dedicated outlet and see if E12 recurs.

If E12 continues on a known-good circuit: The internal low-voltage supply on the control board may be failing. This requires control board replacement by a Bosch service center.