Sharp oven shows F18 and may not accept temperature settings or may show incorrect temperature.

Safety: Turn off power before testing the sensor.

• Verify sensor type: Ensure the replacement sensor (if recently changed) matches the Sharp part number and resistance curve for your model.
• Measure sensor resistance: At room temperature, check the sensor resistance and compare to Sharp specifications. Also test at a known temperature (e.g., 100°C/212°F) if possible.
• Check wiring: Inspect the sensor harness for added resistance due to corrosion or poor splices.
• Control calibration: Some models allow temperature calibration via the user menu. Perform a calibration if the oven consistently over- or under-heats but no hardware fault is found.
• Replace control board: If the sensor and wiring are correct and F18 persists, the control board's analog-to-digital converter may be faulty and the EOC should be replaced.