Microwave stops mid-cycle and displays E04; sometimes accompanied by a burning smell.

Safety first: Unplug the microwave before any inspection. Do not touch internal wiring or high-voltage components.

Steps to address E04:

• 1. Check for misuse: Ensure you are not running the microwave empty or with very low-moisture foods for long periods, which can overheat the cavity.
• 2. Inspect interior: Look for burned food, splatters, or melted plastic on the cavity walls or ceiling. Clean thoroughly with a mild detergent and soft cloth.
• 3. Verify ventilation: Confirm that vents are not blocked and that the unit has proper clearance. Overheating can stress the cavity sensor.
• 4. Power reset: Unplug the unit for 15–20 minutes to allow the sensor and control board to cool and reset. Plug back in and test with a short 30-second heat cycle.
• 5. If E04 returns immediately: The cavity thermistor or its wiring may be defective. These components are typically mounted behind the cavity wall or on the top of the oven and require cabinet removal to access.

Next step: Schedule service with a Toshiba technician to test and replace the cavity temperature sensor or control PCB as needed.