Multicooker displays E4 and refuses to start or aborts cooking shortly after starting.

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

• Inspect and clean lid: Remove the lid and take out the silicone sealing ring, anti-block shield, and any removable pressure cap. Wash all parts in warm soapy water and rinse thoroughly.
• Clear pressure sensor port: On many Breville pressure multicookers, a small hole or channel in the lid leads to the pressure sensor. Use a soft brush or toothpick (do not use metal) to gently clear any food residue.
• Check silicone hoses (if visible): Some models use a short silicone tube between the lid port and sensor. Inspect for cracks, kinks, or disconnection.
• Reassemble carefully: Refit the anti-block shield, sealing ring, and lid components exactly as per the manual, ensuring they are seated evenly.
• Test with water: Add water to the pot, close the lid, and run a short pressure cycle. If E4 persists, the internal pressure sensor or control board likely needs professional replacement.