Induction cooktop zone displays E4 and will not heat.

Safety first: Disconnect power. High voltages and stored energy are present in induction modules.

• Access underside: Remove the cooktop from the counter if necessary and remove the bottom cover to expose the coils and power modules.
• Inspect coil: Check the affected zone's induction coil for cracks, burn marks, or broken windings. Inspect the wiring from the coil to the power board.
• Check connectors: Tighten or replace any discolored or loose spade connectors at the coil and module.
• Module replacement: If the coil appears intact but E4 persists, replace the induction power module for that zone following the service manual.