Microwave displays E05 and will not operate in sensor or auto modes.

Safety: Unplug the microwave before inspection. Avoid contact with high-voltage components.

Steps:

• 1. Allow cooling: If the microwave was used heavily, let it cool for 30–60 minutes with the door open. Overheating can temporarily affect sensor readings.
• 2. Power reset: Unplug for 2–3 minutes, then reconnect and test. Sometimes transient faults clear after a reset.
• 3. Locate the cavity thermistor (advanced): Remove the outer cabinet. The thermistor is typically clipped to the cavity wall or air duct. Inspect for physical damage, loose mounting, or disconnected wires.
• 4. Test thermistor: With a multimeter, measure resistance across the thermistor leads. Compare to Sharp service data if available; an open circuit or dead short indicates failure.

Next steps: Replace the thermistor with the exact Sharp-specified part if faulty. If the thermistor tests good but E05 persists, the main control board may be defective and should be evaluated by a technician.