Multicooker beeps and shows E2, will not heat or start pressure cooking.

Safety first: Unplug the multicooker and allow it to cool completely before opening any covers.

Steps to diagnose:

• Power reset: Unplug for 5 minutes, then reconnect and try a simple program (e.g., sauté). If E2 returns immediately, the sensor circuit is likely faulty.
• Locate the lid sensor: With the unit unplugged and lid open, remove the inner lid plate (usually held by a central screw). Behind it, locate the small thermistor (NTC) pressed against the lid metal, with two thin wires leading into the hinge area.
• Check for damage: Inspect the sensor head and wiring for cuts, burn marks, or pulled wires. Ensure the sensor is firmly in contact with the lid metal surface.
• Check connectors: Remove the top cover (screws around the lid hinge area) to access the lid harness connector on the main control PCB. Reseat the connector and ensure no pins are bent.
• Basic resistance check (for advanced DIYers): Using a multimeter on ohms, measure the NTC sensor at room temperature. A typical MasterPro lid NTC reads between 50–150 kΩ at 25°C. Infinite (open) or near 0 Ω (short) indicates a bad sensor.

Next steps: If the sensor is open/shorted or physically damaged, replace the lid temperature sensor harness. If wiring and sensor test good, the fault may be on the main control board and should be handled by a technician.