Induction cooktop zone shows F15 when a pan is placed on it and does not heat.

Safety: Normal operation testing can be done with power on; internal checks require power off.

• Verify cookware: Use a flat-bottomed, ferromagnetic pan (a magnet should stick firmly to the base). Avoid aluminum, copper, or glass.
• Pan size and position: Ensure the pan base covers the marked cooking zone and is centered. Very small pans may not be detected.
• Test other zones: Try the same pan on another induction zone. If it works there, the issue is specific to one zone.
• Internal inspection (qualified only): Disconnect power, remove the cooktop, and inspect the coil and its sensor wiring for damage. Reseat connectors.
• Module/coil replacement: If wiring is intact and F15 persists only on one zone, replace the corresponding Hotpoint-Ariston induction module or coil assembly as specified in the service manual.