Washer-dryer combo powers on but will not start a cycle; pressing start does nothing.

Safety first: Do not attempt to bypass safety interlocks such as the door lock.

• Check for control lock: Look for a lock icon on the display. Disable child lock by holding the designated button combination (refer to user manual, often pressing and holding two keys for several seconds).
• Confirm door closure: Ensure the door is fully closed and latched. Listen for the click of the door lock engaging when pressing start.
• Test other buttons: If some buttons do not respond, the user interface board or touch panel may be faulty and require replacement.
• Reset power: Unplug the unit for a few minutes, then reconnect and try again. If the issue persists, inspect the UI board and wiring for damage.