Microwave shows E06 and will not start; grill or convection functions may also be disabled on combination models.

Safety first: Unplug the appliance and allow grill elements to cool completely before working near them.

Step-by-step checks:

• 1. Check for overheating signs: Inspect the top interior of the cavity and grill area for discoloration, burnt residue, or warped metal that may indicate overheating.
• 2. Locate grill sensor: On Grundig combination microwaves, the grill sensor is typically clipped near the grill element or in the upper cavity area.
• 3. Inspect wiring: With the outer cabinet removed, follow the sensor wires to the control board. Look for heat-damaged insulation or loose connectors.
• 4. Test sensor: Disconnect the sensor and measure its resistance at room temperature. Compare to the specified value. Replace if open, shorted, or significantly out of range.
• 5. Restore airflow: Ensure that the top and rear vents are not blocked and that the internal fan (if present for convection) runs freely.

If E06 remains after sensor replacement and airflow checks, the control PCB may require replacement by a professional.