Hitachi oven displays F2 and shuts off during baking, often when very hot

Safety first: Turn off power and allow the oven to cool completely before touching any internal parts.

• Check ventilation: Ensure the oven's front and rear ventilation slots are not blocked by cabinetry, foil, or other appliances. Overheating can trigger F2.
• Inspect cooling fan operation: During a bake cycle, the internal cooling fan should run. If it does not, the fan motor or its wiring may be faulty.
• Test temperature sensor: With power off, access the oven cavity back panel and locate the temperature sensor probe. Disconnect its connector and measure resistance with a multimeter. Typical NTC sensors read around 1–1.1 kΩ at 25°C or 1,000–1,100 Ω (check Hitachi service data). A reading far out of range indicates a bad sensor.
• Check control board relays: If the oven continues heating after being turned off, a relay on the control PCB may be stuck closed. Inspect the board for welded relay contacts or burn marks.
• Replace faulty parts: Replace the oven temperature sensor first, as it is the most common cause. If F2 persists, the main control PCB or cooling fan assembly may need replacement.