Induction cooktop displays E4 on one or more zones; zone will not heat.

Safety first: Induction modules contain high-voltage capacitors. Disconnect power and wait several minutes for capacitors to discharge before opening the unit.

• Identify affected zone: Note which cooking zone shows E4 and trace its wiring to the corresponding power module.
• Visual inspection: Remove the bottom cover and inspect the power module for burnt components, cracked IGBTs, or blown tracks.
• Check internal fuses: Some modules have replaceable fuses; test continuity and replace only with identical rated fuses if blown. Investigate cause of failure before re-energizing.
• Module replacement: In most cases, the entire induction power module for that zone must be replaced, as component-level repair is not supported by the manufacturer.
• Reassembly and test: Refit all covers, restore power, and test the affected zone at low power first, then gradually increase.

Note: If multiple zones on the same side fail with E4, the shared power module is likely defective.