Dishwasher displays U2; unit may not start or may stop, often related to door or user settings.

Safety first: No internal work is required initially; keep power connected for control checks.

• Check door: Ensure the door is fully closed and latched.
• Disable child lock: If the control is unresponsive, hold the designated lock button(s) per the user manual to disable the control lock.
• Reset control: Turn the breaker off for 5 minutes, then restore power and attempt to start a normal cycle.
• Review settings: Ensure no conflicting options are selected (e.g., delay start when immediate start is expected).
• If U2 persists: The control panel or main board may be faulty and require service.