Display shows E5 and unit will not pressurize or heat properly

Safety first: Unplug the cooker and ensure it is fully depressurized before opening the lid. Never work on the pressure system while the cooker is hot or under pressure.

• Power reset: Unplug for 10 minutes, then plug back in and try a simple water test. If E5 reappears immediately, proceed with inspection.
• Inspect pressure sensor tube: Many Cosori models use a small silicone or Teflon tube from the lid or steam chamber to a pressure sensor on the control board. Remove the lid and inner components, then check for blockages (starch, food, or scale) in the tube. Clean or replace if clogged.
• Check sensor connector: Remove the bottom cover and locate the pressure sensor module (small plastic block with 2–3 wires and a tube). Ensure its connector is firmly seated on the main board.
• Look for damage: Inspect the sensor body and tubing for cracks, burns, or signs of moisture intrusion. Replace any damaged parts.
• Replace pressure sensor: If cleaning and reseating do not resolve the error, install a new Cosori pressure sensor assembly with fresh tubing. Ensure airtight connections.
• Test with water: Reassemble, add 2–3 cups of water, and run a pressure program. If E5 persists, the main control board may not be reading the sensor correctly and may require professional replacement.