Ilve cooktop or range shows E4 and one or more induction zones do not heat

Safety: Turn off the cooktop at the breaker. Induction modules store high voltage; do not touch capacitors immediately after power-off.

• Cool-down reset: Remove all pans and let the cooktop cool for 20–30 minutes. Restore power and test. If E4 clears, ensure proper cookware and ventilation.
• Check cookware: Use flat-bottom, induction-compatible pans that fully cover the zone. Avoid warped or very small pans on large zones.
• Inspect ventilation: Look under the cooktop for blocked vents or filters. Clean dust and ensure adequate airflow around the induction modules.
• Internal checks (advanced): If E4 persists on a specific zone, the induction power board or its temperature sensor may be faulty. Access requires removing the cooktop from the counter and opening the underside. This involves high-voltage electronics and is best left to a qualified technician.