Microwave shows E8 and fan runs continuously or not at all; cooking may be disabled.

Safety Warning: Unplug the microwave before removing covers. Avoid contact with high-voltage components.

Basic checks:

• 1. Verify airflow: Start a short cook cycle and feel for air exiting the top or front vents. If there is no airflow and E8 appears, the fan may not be running.
• 2. Listen for fan noise: A grinding or rattling sound can indicate a failing fan motor or debris in the blades.

Fan inspection (intermediate DIY):

• 3. Access fan area: Unplug the unit. Remove the outer cover (countertop) or top grille and mounting hardware (OTR) to access the cooling fan assembly.
• 4. Check for obstructions: Inspect the fan blades for grease buildup, foil, or other debris. Clean carefully and ensure the blades spin freely.
• 5. Test motor: With a multimeter, check continuity of the fan motor windings. An open circuit indicates a failed motor that must be replaced.

If the fan motor and wiring are good but E8 persists, the control board fan relay or feedback circuit may be faulty and should be serviced by a technician.