Range or cooktop displays F1 and disables some functions; may occur at power‑on self test.

Safety: Switch off the appliance at the main breaker before opening any panels. Electronic boards can be damaged by static—avoid touching components unnecessarily.

• Power cycle: Turn off power for 10–15 minutes to fully discharge the control. Restore power and check if F1 reappears.
• Check ventilation: Ensure the range or cooktop has proper ventilation per Miele installation specs. Overheating can trigger control faults.
• Inspect wiring: Remove the rear or top cover to access the main control. Check for loose connectors, heat‑discolored wires, or signs of arcing. Reseat all multi‑pin plugs.
• Surge protection: If F1 appeared after a storm or power event, consider installing a surge protector on the circuit to prevent repeat failures.
• Replace control: If F1 persists after reset and wiring checks, the main electronic control module is likely defective and should be replaced with the correct Miele part number.

Note: Programming of some Miele controls may require service tools; if unsure, use an authorized service provider.