Oven display shows F6, some or all heating functions inoperative.

Safety first: Turn off the appliance at the main breaker before removing any covers.

• Check mains supply: Verify that the range is receiving the correct voltage (e.g., 230 V single-phase or 400 V 3N~ depending on model) at the terminal block. Loose connections can cause communication errors.
• Inspect control connections: Remove the rear or top cover to access the electronic oven control and any separate power/relay modules. Ensure all multi-pin connectors are fully seated.
• Look for damage: Examine the relay board for burned spots, cracked solder joints, or swollen capacitors. Any visible damage usually means the board must be replaced.
• Power reset: After reseating connectors, leave the appliance powered off for 5–10 minutes, then restore power and check if F6 returns.

Warning: Live testing on control boards involves dangerous voltages. If you are not trained in electrical diagnostics, have a professional perform further checks and board replacement.