U02 appears; cooker refuses to start pressure or high-heat modes.

Safety first: Ensure the unit is cool and not under pressure before disassembling any caps.

• Check steam cap: Verify that the outer steam cap is installed and locked in the correct orientation.
• Inspect inner pressure cap: Remove and reinstall the inner pressure cap (if your model has one), ensuring it snaps or locks into place as shown in the manual.
• Check pressure gasket: Inspect the round gasket for twists, debris, or damage. Clean with warm soapy water, rinse, dry, and reinstall evenly.
• Clean vent holes: Use a soft brush to clear any starch buildup from the steam vent.
• Restart: After correct assembly, restart the desired program.

When to call a technician: If U02 persists with all parts correctly installed, the pressure detection system may be malfunctioning.