Bosch induction cooktop shows E012 and will not respond to touch inputs or only some keys work.

Safety first: Turn off the circuit breaker and verify the cooktop is completely de-energized before removing it from the countertop.

• Power cycle: Turn the breaker off for 10 minutes, then back on. If E012 clears temporarily and returns, it indicates an intermittent control issue.
• Inspect for moisture: Remove the cooktop (if accessible) and check underneath for signs of liquid intrusion near the control area. Dry any moisture and allow 24 hours before retesting.
• Check wiring (advanced): With power off, remove the glass top and inspect the ribbon cable and connectors between the touch panel and the main control module. Reseat connectors firmly. Look for corrosion or burn marks.
• Replace control assembly: If the error persists and wiring is intact, the touch control module or main power module is likely defective and should be replaced as a complete assembly following Bosch service documentation.