Microwave displays a fan or ventilation error; cooling fan may run continuously or fail to start, and cooking may be disabled.

Safety: Unplug the microwave before inspecting vents or internal components. Internal parts may be hot.

User-level checks:

• 1. Inspect external vents: Check that the intake and exhaust vents are not blocked by cabinets, wall coverings, or debris. Clear any obstructions.
• 2. Listen for fan operation: Start a short heating cycle and listen for the fan. If the fan is excessively loud, rattling, or silent, note the behavior.
• 3. Power reset: Unplug the unit for 5 minutes, then plug back in to clear any latched fan error.

Technician-level checks:

• 4. Test fan motor: With the cover removed, apply appropriate mains voltage to the fan motor (following Sage service procedures) to verify operation. Replace the fan motor if it does not run smoothly.
• 5. Inspect wiring: Check the fan harness from the motor to the control PCB for damage or loose connectors.
• 6. Check control output: Verify that the control board is supplying power to the fan when required. A failed triac or relay may require control PCB replacement.

If the fan is not running or the error persists, discontinue use until the ventilation system is repaired, as overheating can damage the magnetron and other components.