Multicooker displays E4 and will not start pressure or rice programs.

Safety first: Ensure the cooker is unplugged and fully depressurized before working on the lid or valves.

• Check lid closure: Open and close the lid several times, ensuring it aligns with the body and fully locks. Listen for the click of the lid lock mechanism.
• Clean steam release valve: Remove the steam release valve cap and wash it with warm soapy water. Clear any food particles from the vent holes. Reinstall securely.
• Inspect float valve: Remove and clean the float valve and its silicone gasket. Make sure it moves freely up and down and is not stuck with dried food.
• Examine lid lock switch (advanced): On models with a lid lock microswitch, remove the top cover and verify the switch actuator moves when the lid is locked. Test the switch continuity with a multimeter. Replace if it does not change state when pressed.
• Check pressure sensor: Some Hamilton Beach multicookers use a pressure sensor tube connected to the control board. Ensure the tube is not blocked or kinked. If the sensor is faulty, the pressure sensor assembly or main control PCB may need replacement.