Washer-dryer will not start cycle; lights on but Start button does nothing

Safety first: Unplug the appliance before removing the control panel.

• Check child lock: Look for a key or lock symbol on the display. Disable the child lock according to the user manual (often by holding specific buttons for several seconds).
• Confirm door lock: Ensure the door is fully closed and the door lock indicator is on.
• Test Start button: If the button feels stuck or unresponsive, remove the control panel fascia and inspect the switch. Clean or replace the switch or UI board if faulty.