Microwave shows E08 and does not start; grill or convection functions may be disabled on combi models.

Safety: Unplug the microwave and allow it to cool completely before inspection.

• Check ventilation and fan: Ensure vents are not blocked and that the convection/grill fan (if fitted) runs freely. Clean any heavy grease buildup around the grill element area.
• Locate grill/convection thermostats: These are usually mounted near the grill element or on the top of the cavity. Inspect for signs of overheating or damage.
• Test thermostats/sensors: With wires removed, check continuity of thermostats with a multimeter. Normally closed devices should show continuity at room temperature. Replace any open devices that should be closed.
• Replace faulty sensor: If your Bush combi microwave uses a thermistor-type sensor for grill/convection, test its resistance and replace if out of specification.

If E08 persists after replacing faulty thermostats/sensors and ensuring airflow, the control PCB may be misreading temperature and should be checked by a technician.