AGA induction cooktop displays F9 on one or more zones, no heating

Safety first: Isolate the cooker at the mains before any service. Induction modules store high voltages.

• Basic reset: Turn off power for at least 10 minutes to allow capacitors to discharge, then restore power and test. If F9 reappears immediately on the same zone, a hardware fault is likely.
• Check for obvious damage (for skilled users): Remove the hob from the worktop if necessary and inspect the underside. Look for burnt connectors on the affected coil, loose spade terminals, or signs of overheating.
• Swap zone test (technician-level): On some AGA induction models, coils can be swapped between modules to confirm if the fault follows the coil or stays with the module. This should only be done with full wiring diagrams and by a professional.

When to call a technician: F9 almost always requires replacement of the induction power module or coil. Contact an AGA-authorised engineer.