Short answer: If lights and the display work but pressing Start does nothing, the machine almost always thinks the door isn't securely closed, or a control/child lock is engaged — both are checkable in under a minute before assuming anything is actually broken.
1. Door or lid not fully latched
The machine won't start — as a safety measure — unless it confirms the door is securely closed, even if it visually looks shut.
2. Control lock or child lock engaged
Most machines have a lock feature (often activated by holding a specific button) that disables all controls except unlocking, to prevent accidental changes mid-cycle or by children.
3. Selected cycle requires an option you haven't set
Some machines won't start if a required selection (like water temperature on certain models) hasn't been made, though this is less common than a door or lock issue.
4. Start button itself is worn or unresponsive
On machines with physical (not touch) buttons, the start button can wear out and stop registering presses reliably after years of use.
Check for a control lock
Look for a small lock icon on the display. If present, most machines unlock by holding a specific button (often labeled 'Control Lock' or similar) for 3 seconds — check your manual for the exact combination.
Reclose the door firmly
Open the door fully, clear anything caught in the frame or seal, and close it again with a firm, deliberate push until you hear or feel the latch engage.
Power-cycle if needed
If the lock isn't the issue and the door is confirmed shut, unplug the machine for a minute and restart, which clears many minor control glitches.
Test the start button
If nothing else works, try pressing Start firmly several times — a worn physical button may need more deliberate pressure to register.
Most machines show a small padlock icon on the display when it's active. The exact unlock combination (usually holding one or two buttons for a few seconds) varies by brand — check your manual if the icon is present.
The door switch, not your eyes, determines whether the machine considers it closed. A small gap, something caught in the seal, or a latch that's slightly misaligned can all cause this mismatch.
It's unlikely if the display and lights work normally — that confirms the machine is receiving power fine. This symptom is almost always the door/lock/button level, not a wiring issue.
Home Solutions Editorial Team
Reviewed against manufacturer documentation. Updated August 10, 2026. How we write guides
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