Microwave fan continues to run for a long time after cooking has finished.

Safety: This symptom alone is usually not dangerous, but always ensure proper ventilation.

• Check vents: Make sure all vents are clear of obstructions and dust.
• Observe pattern: It is normal for some Bosch models to run the cooling fan for several minutes after cooking, especially after long or high-power cycles.
• Monitor duration: If the fan runs continuously for more than 20–30 minutes after light use, unplug the unit.

If the fan never stops unless unplugged: The fan relay or temperature sensor may be stuck and should be checked by a Bosch technician.