Microwave stops heating after a few seconds and displays an error; fan may continue briefly, then unit shuts down.

Safety: Unplug the microwave before cleaning vents or removing covers. Internal components can be hot immediately after use.

Steps to improve cooling and check airflow:

• 1. Check external vents: Inspect the intake and exhaust vents on the sides, rear, and underside (for built-in/over-the-range models). Remove any dust, grease, or obstructions with a soft brush and vacuum.
• 2. Verify installation clearance: Ensure the microwave has the minimum clearance specified in the Sage manual around sides, top, and rear. Crowded cabinets can cause overheating.
• 3. Listen for cooling fan: Start a short heating cycle and listen for the internal cooling fan. You should hear a steady airflow sound. If the fan is silent or very weak, the fan motor may be failing.
• 4. Allow full cool-down: If the unit shut down on overheat, leave it unplugged for 30–60 minutes to allow thermal cut-outs to reset. Then plug back in and test with a light load of water.
• 5. Clean grease filters (if applicable): For combination or built-in Sage microwaves with grease filters, remove and clean the filters in warm soapy water, dry thoroughly, and reinstall.

Technician-level checks:

• 6. Inspect cooling fan motor: With the cover removed (by a professional), test the fan motor for free rotation and proper voltage during operation. Replace the fan motor if seized or open-circuit.
• 7. Test thermal cut-outs: Check continuity of the magnetron and cavity thermal cut-outs. Replace any that remain open at room temperature.

If the error recurs after cleaning and ensuring proper ventilation, professional service is recommended to replace the fan motor or thermal cut-outs.