Sharp oven shows F10 and will not start a self-clean or high-temperature cycle.

Safety: Disconnect power and ensure the oven is cool before working on it.

• Locate high-limit thermostat: Typically mounted on the top of the oven cavity or rear panel. It may be a non-resettable thermal fuse or a resettable thermostat.
• Test continuity: With wires removed, check the thermostat or thermal fuse with a multimeter. An open reading indicates it has tripped or failed.
• Reset if applicable: Some thermostats have a small reset button. Press it firmly to reset, then re-test continuity.
• Inspect wiring: Check the harness between the high-limit device and the control board for burns or loose connections.
• Replace failed component: Replace the high-limit thermostat or thermal fuse if open and not resettable. If all components test good, the control board may misread the circuit and require replacement.