Samsung · Washing Machine
Samsung Washing Machine SC Error Code
Communication lost between control boards
What this error means
SC reports lost communication between the main PCB and subsystems—often the UI board, inverter, or Wi-Fi module. Buttons may freeze and SC flashes when the handshake fails at power-on or mid-cycle.
How SC is detected
When SC appears on a Samsung washing machine, the control board has confirmed that water did not leave the machine within the programmed drain window. On Samsung WF45T6000AW, Samsung WF45R6100AW, and similar variants, the drain pump runs for a fixed interval—often three to seven minutes on washers and dishwashers—while a pressure switch or turbidity sensor verifies the tub or sump is empty. If water remains, the cycle stops to prevent spin with a full tub or overflow on the next fill.
Most SC calls are resolved without parts: turn breaker off five full minutes. Restricted drain paths mimic pump failure because the impeller spins against a blocked hose or filter. Document whether the pump hums audibly during the drain step; a humming pump with no water movement points to a clogged filter or kinked hose, while silence may indicate a failed pump motor or loose wiring at the harness.
After clearing blockages, run a short cycle and listen at the drain hose for steady water flow. If SC returns on the next load with a clean filter and straight hose, measure resistance at the pump motor connector per the service manual for your model before ordering a replacement pump assembly.
Common causes
- Loose ribbon cable between UI and main board behind the console
- Moisture on connectors from a prior fill hose leak
- Power surge damaging UART communication lines
- Failed UI board or main PCB communication port
Step-by-step fixes
- 1Unplug five minutes for a full board communication reset
- 2Reseat the UI-to-main harness if console access is available per model guide
- 3Confirm no active extension cord or shared circuit causing voltage drop at startup
- 4Note whether SC appears instantly at power-on or only during specific cycle steps
When to call a technician
SC immediately after every reset with dead buttons needs UI board or main PCB replacement.
Affected models
- Samsung WF50R8500AV
- Samsung WF45R6300AV
- Samsung WA54R7600AC
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use washing machines to prevent SC from lint and food debris buildup.
- Record when SC appears in the cycle and whether it clears after a 60-second power reset on your Samsung washing machine—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for SC; Samsung uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting SC; reversed plugs on pumps and valves cause immediate repeat faults.