What does Samsung Dishwasher Won't Start - Causes & Fix mean?

Child Lock is active or the door isn't fully latched. Hold the lock button for 3 seconds, confirm the door clicks shut, and reset power.

How do I fix Samsung Dishwasher Won't Start - Causes & Fix?

Follow the step-by-step diagnosis below. The most likely fix is identified by checking power, sensor resistance, and control-board signals in order — using a multimeter and the part numbers documented in the parts reference table.

Can I keep running the equipment with this fault active?

Generally no. Faults on Appliance units are emitted when a sensor, safety, or control circuit is outside its operating envelope. Running through an active fault risks compressor, heater, or control-board damage. Diagnose and clear the fault first.

What part is most commonly replaced for Samsung Dishwasher Won't Start - Causes & Fix?

The most frequently replaced parts for Samsung Dishwasher Won't Start - Causes & Fix are listed in the Parts Reference section of this guide with OEM part numbers and typical price ranges. Check the table for direct replacements.

Is Samsung Dishwasher Won't Start - Causes & Fix a DIY repair or do I need a technician?

Sensor swaps, fan motor replacements, and condenser cleaning are typical DIY-level repairs. Anything involving refrigerant, gas, or high-voltage (>240V) work requires a licensed technician for both safety and code-compliance reasons.

Samsung Dishwasher Won't Start - Causes & Fix

Samsung Dishwasher Won’t Start — What’s Happening

When a Samsung dishwasher won’t start, it’s a symptom rather than a single fault. If you see no error code on the display, Samsung directs you to check the door latch, Child Lock status, Delay Start setting, and power supply first. If the unit does show a code or blinking lights, the machine has detected a specific condition (water fill, drainage, or leak) that must be addressed before a cycle can begin.

Jump to Fix

Most Likely Causes

Child Lock is enabled The control panel is locked and won’t respond to Start until you hold the designated lock button for about 3 seconds.
Door not fully latched The door hasn’t clicked into place or the latch switch is not signaling closure, so the cycle cannot begin.
Delay Start accidentally set A timed-delay countdown is active and the machine is waiting for the set time to elapse before starting.
No incoming water or low supply pressure The valve is closed, the hose is kinked, or pressure is insufficient, which triggers a 4C fill fault and blocks the cycle.
Leak condition in the base pan Water in the base tray activates the leak sensor (LC code), and the dishwasher refuses to start until the pan is dry and the source is repaired.
Drain hose blockage or 5C fault If the unit can’t drain from a previous cycle or the hose is clogged, it will abort before a new wash begins.
Failed door switch, touchpad, or main control board When simple checks pass but buttons remain unresponsive or the error persists, a component on the control circuit has failed.

How to Diagnose and Fix

Press and hold the Child Lock button (usually marked with a padlock icon) for 3 seconds to unlock the control panel and verify the buttons respond.
Open and close the door firmly until you hear a definite click, then inspect the latch and strike for damage or misalignment.
Check the display for Delay Start or any countdown timer, cancel it if present, and confirm you’re pressing Start once (not holding it long enough to trigger a drain).
Turn off power at the circuit breaker for 30 seconds to 2 minutes, then restore power and retry the cycle.
Look for any error code or blinking-light pattern on the panel and note the sequence (4C for water fill, 5C for drain, LC for leak).
If you see LC or suspect a leak, remove the front kick plate, inspect the base pan for standing water, dry it thoroughly, and run a test cycle to see if the code returns.
For a 4C fill fault, verify the supply valve is fully open, the inlet hose has no kinks, and water pressure is adequate (check if other fixtures have normal flow).
If all checks pass and the dishwasher still won’t start or buttons remain dead, test or replace the door latch assembly, touchpad/user interface board, or escalate to main control board diagnosis.

Parts You Might Need

Part	Notes
Door latch assembly	Amazon \| Includes the mechanical latch and integrated door switch that signals closure to the control.
Touchpad / user interface (UI) board	Amazon \| The membrane keypad and display circuit that communicates button presses to the main board.
Main control board	Amazon \| The central PCB that processes inputs and drives cycle operation; replace when all other components test good.

If your appliance also shows a code on the display, these match this problem:

When to Call a Pro

Call a technician if the dishwasher remains unresponsive after you’ve unlocked Child Lock, confirmed the door latch, cleared any delay timer, reset power, and ruled out water-supply or drainage faults. Diagnosing a failed door switch, touchpad, leak sensor, or main control board requires multimeter testing and part-specific connector checks that are easiest to handle with service documentation and spare inventory on hand.