Induction cooktop shows E9 and shuts down all zones

Safety: Disconnect power at the breaker before any internal inspection.

• Reset: Turn off the cooktop at the breaker for 10 minutes. Restore power and see if E9 clears.
• Check environment: Ensure there has been no liquid ingress under the glass (e.g., from a major boil-over) that could have reached the electronics.
• Internal inspection (technician): Remove the cooktop and inspect the main control and power modules for burn marks, corrosion, or moisture.
• Drying: If moisture is present, carefully dry the area with a low-heat air source and allow 24 hours before retesting (still with power disconnected during drying).
• Replace defective module: If E9 persists, replace the main control module or the combined power module assembly according to Gaggenau parts documentation.