Microwave shows E11 when starting convection or grill mode (on combination models).

Safety: Unplug the microwave-oven combo before any internal inspection. Heating elements and internal metal surfaces can be hot.

Steps:

• 1. Allow to cool: If recently used in convection or grill mode, let the unit cool completely.
• 2. Visual inspection: Check inside the cavity for visible damage to the convection heater cover or grill element. Look for burn marks or warping.
• 3. Thermistor check (advanced): Remove the cabinet and locate the convection thermistor (often near the convection fan or air channel). Test its resistance with a multimeter; an open or shorted reading indicates failure.
• 4. Heater continuity: With the unit unplugged, test the convection heater element for continuity. An open circuit means the element is burned out.

Repair: Replace the faulty thermistor or heater element with Sharp-specific parts. If both test good, the control board's convection circuit may be defective and require professional service.