What the symptom can mean
A locked selection, altered operating sequence and a control fault can overlap. The exact response helps avoid treating every unresponsive button as a failed control board.
Be specific about the control
Name the button, dial or touch area by its printed function. Say what the display did and which neighbouring controls still responded. Copy lock or delayed-start indications that were visible.
Keep model and sequence together
Use the complete model to identify the panel layout. If a power cut or saved programme preceded the change, include that history. Similar-looking controls across a brand can use different settings.