Induction cooktop shows F18 and one or more zones cannot be activated.

Safety: Disconnect mains power before accessing internal components.

• Power reset: Turn off power for 10 minutes, then restore and test. Temporary glitches can clear with a reset.
• Inspect data cables: Remove the cooktop and bottom cover. Locate the low-voltage communication cables between the user interface board and the induction power modules. Reseat all connectors.
• Check module placement: Ensure that any replaced modules are installed in the correct position and that connectors are not swapped between zones.
• Service configuration: Some models require a configuration or learning procedure after module replacement (detailed in the service manual). Perform this if you have access to the instructions.
• Replace faulty module: If F18 persists for a specific zone, replace the associated Hotpoint-Ariston induction module.