Microwave runs but food heats unevenly; some spots are very hot while others remain cold.

Safe to troubleshoot: This is usually not a high-voltage failure.

• Check turntable operation: Ensure the tray rotates smoothly and continuously during cooking. Repair turntable issues as described in related entries.
• Arrange food properly: Spread food evenly on the plate and avoid stacking thick portions in one area. Stir or rotate food halfway through cooking.
• Stirrer inspection (if equipped): Some Ambiano models use a stirrer fan behind a cover in the cavity ceiling. If accessible, ensure the cover is intact and not blocked.
• Magnetron wear: If heating is generally weak and uneven, the magnetron may be aging and losing output, requiring replacement.