Induction hob displays F9 and refuses to operate one or more zones.

Safety first: Disconnect the appliance from the mains before removing any panels. Induction electronics retain charge briefly after power-off.

Steps to check:

• Power reset: Turn off the cooker switch or circuit breaker for at least 5 minutes, then restore power. If F9 reappears immediately, continue.
• Check supply: For multi-phase installations, verify that all phases are present and correctly connected at the terminal block. Loose connections can cause module errors.
• Inspect internal connections: Remove the hob and lower cover. Check the ribbon cable between the touch control/user interface PCB and the power module. Reseat both ends.
• Look for damage: Examine the power module for burnt components, cracked solder joints, or bulging capacitors. Any visible damage usually means the module must be replaced.
• Module replacement: If no simple wiring issue is found, the affected induction power module should be replaced with the correct Rangemaster part. This is advanced work and should be carried out by a qualified technician.