F9 displayed; oven may not start or may shut down; sometimes associated with power supply issues.

Safety: Only qualified persons should measure live mains voltage. Always turn off power before tightening connections.

• Check supply: Verify the correct voltage at the wall supply or junction box (e.g., 240 V split‑phase or 230 V single‑phase, depending on region and model).
• Inspect terminal block: Remove the rear cover and inspect the mains terminal block. Tighten any loose screws and look for heat discoloration or melted plastic. Replace the block if damaged.
• Check wiring: Confirm that L1, L2, and N (if used) are correctly connected per Miele wiring diagram.
• Control power supply: If supply and terminal block are correct, the internal low‑voltage power supply on the main control may be faulty, requiring control module replacement.