Dishwasher powers on but will not start a cycle; Start button beeps or flashes and nothing happens.

Safety first: Disconnect power before removing the control panel if needed.

• Confirm door closure: Close the door firmly until you hear the latch click. Check for dishes or racks preventing full closure.
• Check child lock: Refer to the user manual to see if a child lock function is active (often indicated by a key symbol). Disable it using the specified button combination.
• Reset control: Turn off power at the breaker for 5 minutes, then restore and attempt to start a cycle again.
• Test Start button: If other buttons respond but Start does not, the control panel may be faulty. Replace the user interface assembly if the Start key is unresponsive.

If the dishwasher still refuses to start, further diagnostics of the control board and sensors may be required.