E1 appears shortly after starting a cooking program and the multicooker stops heating.

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

• Access the bottom panel: Turn the unit upside down on a soft cloth. Remove the screws securing the base cover to access the internal wiring (only if you are comfortable doing so and this does not void your warranty).
• Locate the NTC sensor: On ProCook multicookers the temperature sensor (NTC) is usually clipped to the underside of the inner heating plate or attached to the side of the inner pot well. It connects to the main PCB via a small 2-wire plug.
• Check connections: Ensure the NTC plug is firmly seated on the control board and that the wires are not pinched or broken. Reseat the connector by unplugging and plugging it back in.
• Visual inspection: Look for burnt spots, corrosion, or broken insulation on the sensor wires. If the sensor capsule is cracked or the wires are broken, the NTC sensor must be replaced.
• Reassemble and test: Refit the base cover, plug the unit in, and run a short program with water in the pot. If E1 persists, the NTC or main PCB is likely faulty and should be replaced.