Multicooker will not start a program; display shows E1 shortly after power-on or when pressing Start.

Safety first: Unplug the Polaris multicooker from the mains and allow it to cool completely before opening any covers. Never work on a hot unit.

• Power reset: Disconnect the cooker for 10–15 minutes, then plug it back in and try a simple program (e.g., "Reheat"). If E1 returns immediately, continue.
• Check bottom sensor wiring: Remove the inner pot and inspect the metal heating plate at the bottom. From the underside (after removing the bottom cover), locate the small NTC sensor clipped to or embedded in the heating plate. Verify that its two wires are intact and firmly connected to the wiring harness.
• Inspect connectors: Follow the sensor wires to the main control board. Reseat the plug by disconnecting and reconnecting it several times to clear oxidation. Look for burnt or corroded pins.
• Measure sensor resistance: Using a multimeter (ohms), measure across the NTC leads. A typical Polaris NTC at room temperature is usually between 50 kΩ and 100 kΩ (check service data if available). If the reading is infinite (open circuit), the sensor is defective.
• Replace the sensor if open: If the NTC is open or physically damaged, replace it with a compatible Polaris bottom temperature sensor (NTC) for your exact model. Clip it back to the heating plate and route the wires as originally installed.
• Control board check: If the sensor tests good but E1 persists, the analog input on the main control board may be faulty. At this point, replacement of the main control module is recommended and is best done by a qualified technician.