Samsung Dishwasher Error Code SYMPTOM‑WONT‑START — How to Fix (Dishwasher Won’t Start)

Understanding Samsung SYMPTOM‑WONT‑START

When a Samsung dishwasher refuses to start, the controller treats the condition as a safety lock‑out. The most common culprits are the door‑latch system, the water‑inlet valve, and the flood (leak) sensor. Each component tells the controller whether it is safe to energize the pump, heater, and motor. If any one of them reports a problem, the board blocks the start command to protect your home.

The symptom does not appear as a numeric code on the display; instead, the machine stays dark, makes no noise, and does not fill. Technicians use the SYMPTOM‑WONT‑START label to describe exactly what they see.

What You’ll Notice

• Pressing Start does nothing; the control panel stays dark.
• No water enters the tub and the pump never runs.
• The dishwasher makes no audible clicks or whirring noises.
• In some models, the LED indicator flashes briefly before going dark.

These signs point to a blockage in the start‑up logic rather than a simple programming glitch.

Typical Reasons for No‑Start

• Door latch not fully engaged – The latch lever fails to reach the closed position, keeping the interlock switch open.
• Faulty door latch switch – Even if the latch clicks, a broken switch will not close the circuit.
• Water inlet valve not receiving power – A tripped internal fuse or a defective control board stops voltage from reaching the valve.
• Flood sensor detecting moisture – A stuck or contaminated sensor tells the board that water is leaking, which disables the start sequence.
• Control board power failure – Burned‑out fuses or damaged power modules cut off the entire system.

If you have a Samsung model such as DW80R9950US or DW60M5052FS, the same checklist applies, but note that the latch mechanism on the DW80 series uses a plastic cam that can crack under repeated use.

Quick 60‑Second Reset

1. Unplug the dishwasher or turn off the breaker for one minute.
2. Plug it back in and look for the standby light.
3. Close the door firmly and listen for the latch click.

If the light comes on and the click is audible, the problem is likely deeper than a simple reset, and you should continue with the detailed steps.

Detailed Step‑by‑Step Repair

Safety First

• Always disconnect power before removing panels or probing electrical components.
• Turn off the water supply when working on the inlet valve to prevent accidental spray.
• Wear insulated gloves when handling live wires.

Step 1 – Power‑cycle the appliance

Disconnect the dishwasher from the wall outlet or switch off the dedicated breaker. Wait a full 60 seconds; this allows stored charge in capacitors to dissipate. Re‑energize the unit and watch for any indicator lights. If the display remains dark, move on to the next step.

Step 2 – Confirm the door is fully closed

Open the door, then close it with a firm push until you hear a solid “click.” Visually inspect the latch lever; it should sit flush against the door frame. A mis‑aligned latch can be nudged back with a small Phillips screwdriver without removing any panels.

Step 3 – Test the door latch switch

Locate the switch behind the latch assembly (usually a rectangular component with two wires). Disconnect the harness, set the multimeter to continuity, and touch the probes to the terminals. When the door is closed, the meter should beep continuously. No beep means the switch is open and must be replaced. A stuck‑open switch prevents the controller from receiving a “door closed” signal.

Step 4 – Verify the water inlet valve receives voltage

Remove the lower front panel to expose the inlet valve. Turn off the water supply to avoid spray. With the dishwasher powered, set the multimeter to AC voltage and probe the two valve terminals while the control board attempts to start a cycle. A healthy valve shows line voltage (120 V in North America, 230 V in Europe). Zero volts indicates the board is not sending power—check the board’s fuse or power module.

Step 5 – Inspect the flood (leak) sensor

The flood sensor is a small silver disc near the bottom of the tub. Disconnect its connector and measure resistance with the multimeter set to ohms. A healthy sensor reads between 2 kΩ and 5 kΩ. An open circuit (infinite resistance) tells the controller that a leak is present, preventing start. Clean the sensor gently if it looks dirty; mineral buildup can mimic a fault.

Step 6 – Check the control board’s power supply

Remove the outer kickplate and locate the main control board. Look for a blown fuse (often a 5 A glass cartridge) and any burnt components. Using the multimeter, verify that line voltage (120 V or 230 V) is present at the board’s input terminals. Absence of voltage after confirming the breaker is on points to a failed board that will need replacement.

Step 7 – Reassemble, run a test cycle, and observe

Reconnect all harnesses, replace the front panel, and close the door. Select a quick wash and press Start. The dishwasher should begin to fill with water within a few seconds. If it still refuses to start, note any error codes that appear and consider professional diagnosis.

Cost Estimates

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