Warning: Disconnect power before servicing.
ErrBase

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.

A Samsung dishwasher that powers on but won't start a cycle is usually caused by child lock (CL), a door latch that is not fully engaging the microswitch, or an active error code blocking operation. Unlike 'won't turn on' where the machine is completely dead, 'won't start' means the control panel works but the cycle does not begin.

SamsungDishwasherSeverity: moderate88% DIY Success
Time to Fix
2–20 min
Difficulty
beginner
Parts Cost
$20 – $35
Tools Needed
Flashlight for latch inspection

What Does the WONT-START Code Mean?

When a Samsung dishwasher has power but won't start, the machine's safety interlocks are active. The door latch switch must close, child lock must be off, and no blocking error codes can be present. All three are checked before any cycle will run.

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

  • Display is on and responsive but Start button does not begin cycle
  • Pressing Start produces a single beep but no action
  • Machine shows CL on display
  • Previous cycle error code still shown
  • Door light on but machine will not start

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

Hold Start/Cancel for 3 seconds to clear any stuck state, then reselect cycle and press Start.

Tools Required for Diagnosis

Flashlight for latch inspection

Diagnostic Checklist

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

1

Check display for CL or a lock icon

Check display for CL or a lock icon. If present: hold Sanitize + Hi-Temp (or your model's lock button combo) for 3 seconds to deactivate child lock.

2

Open and firmly re-close the door

3

Look at the display for any error code

4

Hold Start/Cancel for 3 seconds to perform a soft reset

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
Door Latch AssemblyDD81-02028A · $20–$35

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $28 (Parts) vs $725 (New Machine)

Frequently Asked Questions

Why does my Samsung dishwasher beep but not start?
A single beep when pressing Start usually means a safety interlock is active. Check for child lock (CL on display), confirm the door is fully latched with a click, and check for any error code on the display.
How do I know if my Samsung dishwasher door is fully closed?
You should hear and feel a firm click when the door latch engages. If the door feels springy or there is no click, push harder or inspect the latch for wear. A door that looks closed but is not fully latched will prevent the machine from starting.

Related Samsung Dishwasher Error Codes

Code: WONT-TURN-ONSamsung Dishwasher Won't Turn OnCode: UNLOCKHow to Unlock a Samsung DishwasherCode: 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 StallSamsung washerSamsung Washer 3E Error Code: Motor FaultSamsung washerSamsung Washer 4C Error Code: No Water SupplySamsung 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

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

Last verified for technical accuracy on March 14, 2026