Direct answer: When a dishwasher lights up but will not start, the most common causes are a door that is not fully latching, control lock being on, a cycle that was not actually selected, or a stuck dishwasher float telling the machine it is already full.
Most likely: Start with the door and controls. If the display responds but nothing happens when you press Start, a mislatched door or failed dishwasher door latch is more likely than a major electronic failure.
This one fools a lot of people because the dishwasher clearly has power. Reality check: lights on only prove part of the machine is awake, not that it sees a safe start signal. The common wrong move is pressing Start over and over without checking whether the door is actually catching or the controls are locked.
Don’t start with: Do not start by ordering a dishwasher control board. On this symptom, that is usually not the first bad part.
The panel lights up normally, but pressing Start does nothing and you do not hear filling, draining, or latching sounds.
Start here: Check control lock, then make sure a full cycle is selected and the dishwasher door clicks shut firmly.
You press Start and get flashing lights or warning beeps, but the cycle never begins.
Start here: Focus on the dishwasher door latch first. That pattern often means the control is waiting for a closed-door signal.
The dishwasher looks ready, but after closing the door it returns to standby or sits there.
Start here: Re-enter the cycle from scratch and check for a stuck dishwasher float or delayed-start setting.
Other buttons light or change settings, but Start will not launch a wash cycle.
Start here: Look for control lock, a worn Start pad on the user interface, or a door latch that is not proving closed.
A dishwasher will power up with the door slightly off, but it will not start a wash cycle unless the latch switch proves the door is shut.
Quick check: Open and close the door firmly. Listen for a solid click and press inward on the top of the door while pressing Start.
Many dishwashers light up and accept some button presses while still blocking the cycle from starting.
Quick check: Look for a lock icon or delay indicator. Press and hold the marked lock button for several seconds, then cancel and reselect a normal cycle.
If the float is jammed by debris, soap residue, or a utensil, the dishwasher may think it is already full and refuse to begin filling.
Quick check: Find the float in the tub floor and gently lift and lower it. It should move freely and drop back down without hanging up.
If the settings change normally but the machine still will not begin after the simple checks, the latch switch or Start key is a common next suspect.
Quick check: Watch for a blinking Start light, weak latch feel, or a Start button that feels dead compared with the other keys.
A half-entered cycle, control lock, or delayed start can make a powered dishwasher look broken when it is really just waiting for the right input.
Next move: If the dishwasher starts filling or draining, the problem was a control state issue rather than a failed part. If the panel still lights up but the cycle will not begin, move to the door and latch checks.
What to conclude: You have confirmed the dishwasher has at least partial power, so the next most useful check is whether it sees a valid closed-door signal.
A dishwasher can look closed and still miss the latch by just enough to block startup.
Next move: If pressing the door inward lets the cycle start, the latch is worn, misaligned, or obstructed. If the door feels solid and still will not start, check the tub float next.
What to conclude: A weak catch or no-click feel points strongly toward a dishwasher door latch issue, especially when the display and other buttons still work.
A stuck float can stop the fill sequence before the cycle really gets going, which feels like a no-start complaint.
Next move: If the dishwasher starts after freeing the float, the issue was a blocked or sticky overfill float. If the float moves normally and the dishwasher still will not start, the latch or control input is more likely.
Once the easy checks are done, the door latch is the strongest repair path on this symptom because the machine has power but will not get the start permission it needs.
Next move: If door pressure or a firmer slam makes it run, a dishwasher door latch is the most likely fix. If the latch feels solid and the dishwasher still ignores Start, the user interface or electronic control may be at fault.
At this point you have ruled out the common no-part causes and narrowed the problem to the most likely component path.
A good result: If a new latch restores normal starts without pushing on the door, you found the right fix.
If not: If a confirmed latch repair does not change the symptom, the next likely issue is in the user interface or control circuit and that is usually where pro testing saves money.
What to conclude: You now have a clean next move instead of guessing at expensive electronics.
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Most often, the dishwasher is not seeing a closed-door signal. A control lock setting, delayed start, or stuck dishwasher float can also keep it from beginning even though the lights are on.
Yes. A blinking Start light or repeated beeping after you shut the door often points to a latch that is not proving closed. If the dishwasher starts when you press on the door, that clue gets even stronger.
No. On this symptom, a dishwasher control board is not the first thing to buy. Check the door latch, control lock, cycle selection, and float first because those are more common and easier to confirm.
The float tells the dishwasher whether the water level is too high. If it sticks in the up position, the machine may think it is already full and refuse to start filling, which can look like a no-start problem.
That can happen when the control lock is on, the cycle was not fully selected, the dishwasher door latch is not proving closed, or the Start key on the user interface has failed. Rule out the simple settings and door checks before suspecting the console.
A few normal test attempts are fine, but stop if you smell burning, see flickering or arcing, or the dishwasher trips the breaker. Repeated hard slamming of the door is also a bad idea because it can damage the latch further.