Multicooker displays E04 and aborts the cooking cycle shortly after starting.

Safety first: Unplug the unit and ensure there is no pressure in the pot before inspecting any pressure components.

• Release pressure: If the unit was in a pressure program, ensure all steam has been released and the float valve has dropped before opening the lid.
• Clean pressure sensor path: On many Ninja pressure cookers, a small channel or port connects the cooking chamber to the pressure sensor. Remove the inner pot and inspect the central area and lid for small holes or channels. Use a soft brush or toothpick to clear food residue (do not enlarge the hole).
• Dry condensation: Allow the unit to air dry for several hours in a warm, dry area in case moisture has entered the sensor path.
• Test with water only: Add 2 cups of water, close and lock the lid, and run a short pressure cook cycle. If E04 reappears, the sensor or control board is likely faulty.
• Do not bypass safety: Never attempt to bypass the pressure sensor. Contact a professional for sensor or board replacement.