U02 appears and the cooker beeps repeatedly, usually when trying to open the lid after cooking.

Safety first: Never force the lid open while the cooker indicates pressure or while steam is escaping.

• Allow natural release: Let the cooker sit until the float valve drops and the display no longer shows pressure. This may take 10–30 minutes depending on contents.
• Use quick release (if recipe allows): Carefully move the steam release valve to VENT, keeping hands and face away from the steam path. Wait until all steam has escaped and the float valve drops.
• Check float valve movement: Once cool and depressurized, press the float valve up and down from inside the lid. Clean any food residue that may cause sticking.
• Inspect lid lock: Ensure the lid lock slider moves freely. Clean around the lock area.
• Service note: If U02 appears even when the cooker is cold and depressurized, the lid lock or float valve sensor may be faulty and should be checked by a technician.