Washer-dryer combo powers on but will not start any cycle; pressing Start does nothing and no error code is shown.

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

• Check door lock: Ensure the door is fully closed and latched; many models will not start if the door is not detected as closed.
• Disable child lock: Look for a key or lock icon on the display. Disable child lock by holding the designated buttons (refer to RCA manual, often pressing and holding two buttons for several seconds).
• Try different cycles: Select another program and press Start to rule out a specific cycle issue.
• Inspect control panel connections: Remove the top and control console. Reseat the ribbon cable and connectors between the user interface and main control board.
• When to replace parts: If the Start button is unresponsive and other buttons work, replace the user interface/control panel assembly. If no buttons respond, the main control board may be faulty.