Microwave displays E2 and stops heating or will not start

Safety first: Unplug the microwave. Internal components can retain high voltage; do not touch the high-voltage section.

• Check ventilation: Ensure the top, sides, and rear vents are not blocked. Remove any items blocking airflow and clean dust from vents with a soft brush or vacuum.
• Allow cooling: If the microwave has been used heavily, let it cool for 30–60 minutes, then plug it back in and test. Overheating can temporarily trigger sensor errors.
• Inspect cavity for damage: Look for burnt spots, peeling paint, or exposed metal that might cause abnormal heating. Do not use the microwave if the cavity coating is badly damaged.
• Internal thermistor check (advanced): The cavity thermistor is usually mounted on the side or top of the cooking cavity behind the outer cover. If you are experienced, remove the outer cover and inspect the small sensor and its wiring for burns, breaks, or loose connectors.
• Replace faulty sensor: If the thermistor is physically damaged or tests open/shorted with a multimeter, replace it with a Haier-compatible cavity temperature sensor.
• If E2 persists: The main PCB may have a failed sensing circuit and will need replacement by a technician.