U03 appears and the unit will not start; often occurs when the inner pan is missing.

Safety first: Never operate the cooker without the inner pan.

• Install inner pan: Place the correct Zojirushi inner pan into the cooker, ensuring it is dry on the outside.
• Seat properly: Rotate the pan slightly to ensure it sits flat on the heating plate.
• Restart: Press CANCEL/RESET if available, then select your program and press START.

When to call a technician: If U03 appears with the correct pan properly installed, the pan detection sensor may be faulty.