Microwave shows E5 and stops heating; may beep repeatedly and shut down mid-cycle.

Danger: Inverter-based microwaves operate at very high voltage and frequency. Do not attempt inverter or magnetron repairs without proper training and tools. Always unplug the unit and discharge the capacitor before any internal work.

Basic checks you can safely perform:

• 1. External reset: Unplug the microwave for 10 minutes. Plug back in and test. If E5 returns immediately, internal service is required.
• 2. Check for obvious damage: With the cabinet removed (if you are competent to do so), visually inspect the inverter board for burnt components, cracked solder joints, or melted connectors. Do not touch the board traces or components.
• 3. Inspect wiring: Look for loose or burnt connectors between the inverter, magnetron, and control board. Any signs of arcing or burning indicate the need for professional replacement of affected parts.
• 4. Professional repair: In most cases, E5 requires replacement of the inverter board and sometimes the magnetron. This should be done by a qualified appliance technician due to shock and radiation risks.