Microwave shows E10 and may shut down or refuse to start; often associated with convection models.

Safety first: Unplug the microwave and allow all internal parts to cool.

Step-by-step checks:

• 1. Confirm model features: E10 typically appears on Grundig microwaves with convection (hot air) function.
• 2. Access convection fan: Remove the rear interior panel of the cavity (if accessible) or the outer cabinet to reach the convection fan assembly at the back of the cavity.
• 3. Inspect fan blades: Check for baked-on grease, foil, or food debris obstructing the fan. Clean carefully with a non-metallic tool and cloth.
• 4. Spin test: Rotate the fan by hand; it should move freely without grinding. If stiff or seized, the motor is likely faulty.
• 5. Check wiring: Inspect the motor connector and wiring harness for heat damage or loose connections.
• 6. Replace motor if defective: Install a compatible Grundig convection fan motor and reassemble all panels securely.

If E10 persists after motor replacement and wiring checks, the control PCB's convection fan drive circuit may be defective and should be serviced professionally.