Induction hob shows E1 and may beep; zones may not start.

Safety first: Turn off the hob and allow it to cool for at least 30 minutes.

User checks:

• Ensure that the oven below (if V-ZUG or other brand) is correctly installed with the required insulation and ventilation as per both appliances' manuals.
• Do not operate the hob at maximum power on all zones for extended periods if the cabinet ventilation is marginal.
• Check that drawers or panels under the hob are not pressing against the underside, blocking airflow.

If E1 recurs frequently even with correct installation, a technician should inspect the cooling fan and temperature sensors on the electronics.