Multicooker beeps and shows E2; programs will not start or abort shortly after heating begins.

Safety first: Unplug the cooker and let it cool fully. Do not attempt measurements on a live appliance.

• Visual inspection: Remove the inner pot and bottom cover. Locate the NTC sensor on the heating plate. Check for melted insulation, crushed wires, or signs of moisture ingress causing a short.
• Check resistance: With a multimeter, measure resistance across the sensor leads. A reading near 0 Ω indicates a shorted sensor. Compare with expected room-temperature value (typically tens of kΩ).
• Inspect harness routing: Ensure the sensor wires are not pinched between the chassis and plastic covers or touching sharp metal edges. Re-route and secure with high-temperature cable ties if needed.
• Replace shorted sensor: If the NTC reads near 0 Ω or shows visible damage, replace it with the correct Polaris bottom NTC sensor for your model. Ensure good thermal contact with the heating plate and proper electrical isolation.
• Board diagnosis: If the sensor and wiring are good but E2 remains, the main control board's sensor input may be internally shorted. Replacement of the main control board is required; consider professional service.