Samsung Dishwasher Won't Start

Quick Answer

Samsung Dishwasher not starting: check that the door or lid is fully closed first, then verify the breaker is on and child lock is not enabled. Try a power reset (unplug 2 minutes). If still dead, test the door switch and thermal fuse with a multimeter.

Most of the time when I show up for a Samsung dishwasher that won't start, it's something stupid simple like child lock or a door that's 90% closed but not quite there. But if you've already ruled those out and it's still dead, don't keep mashing Start. A hung control board or a blown thermal fuse will never respond to that. Ignoring it usually means a bigger repair bill later.

SamsungDishwasherSeverity: moderate88% DIY Success

Time to Fix

2–20 min

Difficulty

beginner

Parts Cost

$20 – $35

Tools Needed

Phillips #2 screwdriver, Torx T20 screwdriver (for some Samsung door panel models)

Samsung Dishwasher Won't Start

OK so here's the deal. A Samsung dishwasher that powers on but won't run is almost never a dead motor. Nine times out of ten it's child lock, a door latch not fully engaging, or an error code still sitting in memory. Sometimes it's a blown thermal fuse, which is $15 in parts and 45 minutes of your Saturday. Worth knowing: Samsung's control boards are really sensitive to power flickers and they'll just sit there frozen until you force a hard reset.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Child lock (CL) active40%

Door latch microswitch not engaging24%

Active error code preventing cycle start14%

Water supply issue detected at startup preventing fill12%

Delay start set - machine is waiting for countdown10%

Symptoms You May Notice

You press Start and get one beep, then absolutely nothing. No humming, no water sounds, just silence.
The display is fully lit and buttons all beep when touched, but the cycle never actually begins no matter what you press.
CL is showing on the display and none of the cycle buttons respond to anything until you unlock it.
There's a previous error code still showing (4C, LC, OC, OE, whatever) and the machine refuses to clear it on its own.
The door light is on but pressing Start does nothing, or the door feels slightly springy instead of firmly locked in place.

Can you reset a Samsung dishwasher to clear the WONT-START code?

Hold Start or Cancel for three full seconds until the drain pump kicks on. Let it run completely, about 60 seconds, then wait 30 more seconds before touching anything. If the display's still acting weird after that, go to the breaker and kill it for five full minutes, not two. Five. That's long enough to fully discharge the control board capacitors and clear whatever's stuck in memory. Come back, flip the breaker, wait for the display to fully boot, then try a Normal cycle.

Tools Required for Diagnosis

Phillips #2 screwdriverTorx T20 screwdriver (for some Samsung door panel models)Digital multimeter with continuity settingFlashlight or headlamp for latch inspectionNeedle-nose pliers for disconnecting wire harness connectorsLevel to check if dishwasher is sitting plumb

Service / Diagnostic Mode

On most Samsung dishwashers, hold Hi-Temp Wash and Heated Dry simultaneously for about 3 seconds. The display should cycle through self-diagnostic codes. Not all models support this, and some use different combos, so check your model's tech sheet (usually taped inside the door frame or behind the kickplate).

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

Did the fix not work?

If the problem comes back after following these steps, a component has permanently failed and needs replacement. Check the specific error code your dishwasher is showing:

WONT-TURN-ON Error →UNLOCK Error →HOW-TO-START Error →

ComponentComponent Under Test

Expected Range0–2 ohms

ConditionIf Open (OL) or infinite, replace component.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Door Latch AssemblyDD81-02028A · $20–$35	DD81-02028A	$20 – $35

Frequently Asked Questions

Why does my Samsung dishwasher beep but not start?

That single beep means the board heard your button press but a start condition isn't met. Usually it thinks the door's still open even when it looks closed to you. The microswitch inside the latch needs to physically click closed, not just the door being pushed shut. Give it a real firm push. If it still just beeps, check whether the Delay Start light is on because that'll make it seem broken when it's just waiting on a timer. And if you see any error code on the display at all, that code is your answer right there, the machine won't start until it's cleared.

How do I know if my Samsung dishwasher door is fully closed?

You should feel a definite click when it latches, not a soft thud. If you push the door and it feels springy or you can wiggle it even slightly, it's not fully latched. Samsung's tub can also shift if the dishwasher isn't level, which throws off the alignment between the door hook and the strike plate. Set a level on top of the door. If it's more than a quarter inch out of level side to side, that could be causing the latch to miss. Adjust the front leveling feet until it sits plumb and try again.

Can I fix a Samsung dishwasher that won't start myself, or do I need a tech?

Honestly? Most of these no-start issues are totally DIY-friendly. Child lock, door latch, soft reset, those are all things you can knock out in under 15 minutes. Even a thermal fuse replacement is pretty manageable, maybe 30-45 minutes if you've never done it before. Where I'd say call a tech is if you're looking at the control board itself. Boards on Samsung dishwashers run $80-$150 for the part alone, and you want someone to confirm that's actually dead before you spend that money. I've seen people buy boards when it was just a $12 fuse. Always test the fuse first.

How do I turn off child lock on my Samsung dishwasher?

Look for CL on your display or a lock icon. Most Samsung models: hold Sanitize and Hi-Temp Wash at the same time for 3 seconds. You'll hear a beep and CL disappears. Some models use different buttons, like holding the two buttons flanking the power button for 3 seconds. If neither works, check the sticker inside your door frame because Samsung usually prints the unlock combo right there on a label. If child lock keeps activating on its own without anyone touching it, you've probably got a stuck or moisture-damaged touchpad button that's sending phantom signals to the control board.

My Samsung dishwasher has power but completely nothing happens when I press Start. What now?

If buttons beep when you press them but Start does nothing specifically, it's almost always child lock or an active error code. But if nothing responds at all, not even a beep, you've got either a blown thermal fuse or a dead control board. Do the thermal fuse test first with a multimeter since the part is $10 and easy to get to. If that fuse has continuity and everything else checks out, you're probably looking at a control board. Before you buy one though, do a full hard reset with the breaker off for 5 full minutes. I've personally seen boards come back to life from that more than once.

Related Samsung Dishwasher Error Codes

Code: WONT-TURN-ONSamsung Dishwasher Won't Turn On Code: UNLOCKHow to Unlock a Samsung Dishwasher Code: HOW-TO-STARTHow to Start a Samsung Dishwasher

Same Fix Works on These Brands

Samsung shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

Samsung washerSamsung Washer 3C2 Error Code: Motor Stall Samsung washerSamsung Washer 3E Error Code: Motor Fault Samsung washerSamsung Washer 4E Error Code: Water Supply Fault (Top Load)Samsung washerSamsung Washer 5C Error Code: Drain Error (Older Display)Samsung washerSamsung Washer 8C Error Code: Vibration Sensor Fault Samsung washerSamsung Washer 8E Error Code: Motor Frequency Sensor Fault

Models Known to Experience WONT-START Errors

This repair applies to most Samsung dishwashers with this error code. Common model numbers include:

DW80R9950US, DW80R2031US, DW80T5040US, DW80K5050US, DW80N6070US, DW80M9550US

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 14, 2026