F5 error appears and oven may not start or may shut down unexpectedly

Safety first: Disconnect power at the breaker before accessing the control compartment.

• Power cycle: Turn off power for 10–15 minutes to allow the control to fully discharge. Restore power and check if F5 returns.
• Listen for relays: When starting a bake cycle, listen for clicking from the control board. No clicks or continuous clicking may indicate relay failure.
• Inspect wiring: With power off, check that all element wires are firmly attached to the control board terminals and elements, with no signs of burning.
• Check for visible board damage: Remove the control board and inspect for burnt spots, cracked solder joints, or swollen components. If present, replace the board.
• Reconfigure if applicable: Some Ikea models require configuration codes after board replacement. Follow the service manual or label on the new board to set the correct model code.

Recommendation: Because this involves mains-voltage relays and configuration, many users should have a professional replace and program the control board.