Microwave stops mid-cycle and displays E05; may be accompanied by a hot exterior cabinet.

Safety: Unplug the microwave and allow it to cool completely before further checks. Do not cover vents or operate the unit empty.

Ventilation and usage checks:

• Ensure that all installation clearances specified in the SMEG manual are respected. Move the unit away from walls or cabinets if necessary.
• Inspect side, rear, and top vents for dust, grease, or obstructions. Clean with a soft brush and vacuum.
• Confirm that you are not running the microwave for excessively long periods at maximum power without rest, especially in built-in models.

Reset:

• After cooling for at least 30 minutes, plug the microwave back in.
• Run a short test (30–60 seconds) with a cup of water. If E05 reappears quickly, stop using the unit.

Technician-level checks:

• Test the cavity temperature sensor (NTC) for correct resistance at room temperature and replace if out of specification.
• Check the cavity thermal cut-out for continuity and replace if open.
• Verify that the cooling fan operates correctly during cooking.
• Inspect the control PCB for faults in the temperature sensing circuit.

Persistent E05 indicates a sensor or control fault that should be addressed by a qualified technician.