Oven will not heat, display shows F01 shortly after a heating cycle is started.

Safety first: Disconnect the oven from mains power by switching off the circuit breaker or removing the fuse. Verify with a multimeter that no voltage is present before touching internal components.

• Power reset: Leave the oven disconnected for at least 5–10 minutes to discharge the control board. Reconnect and test. If F01 returns immediately, continue below.
• Access the control board: Remove the oven from the cabinet if built‑in. Take off the top or rear cover (depending on model) to access the main electronic control board (often labeled as “EPC”, “ECO”, or “Power Module”).
• Visual inspection: Check for burnt areas, cracked solder joints under the heater relays, or swollen capacitors. Any visible damage usually means the board must be replaced.
• Check heater relay contacts: With power still disconnected, inspect the main heater relay on the PCB. If the plastic housing is melted or discolored, the relay is likely welded or failed.
• Connector check: Ensure all harness plugs to the control board are fully seated and not heat‑damaged. Reseat each connector once.
• Replacement: If no loose wiring is found and F01 persists, replace the main electronic control board with the exact Bauknecht spare (match model and service number). Transfer any wiring one connector at a time to avoid mis‑wiring.

Warning: Board‑level repair (soldering, component replacement) should only be done by qualified technicians. For most users, replacing the complete control board is the safest option.