Hitachi oven shows F5 and does not start, often related to door operation

Safety first: Turn off power before working near the door lock mechanism.

• Check door closure: Ensure the oven door closes fully and evenly. Look for bent hinges or obstructions on the door seal.
• Listen for lock motor: When starting a self-clean or certain high-temperature modes, you should hear the door lock motor engage. No sound may indicate a failed lock motor or no power to it.
• Inspect latch and strike: Examine the metal latch on the door and the strike on the frame. If bent or loose, adjust or tighten screws.
• Test door switch (advanced): With power off, remove the top/front panel to access the door lock assembly. Use a multimeter to test continuity of the door switch when the lock is engaged and disengaged.
• Replace door lock assembly: If the motor does not run or the switch is faulty, replace the complete Hitachi door lock assembly for reliability.