Washer-dryer combo stops at the beginning of the cycle with 4C displayed and no water entering.

Safety first: Unplug the unit and close water valves before hose removal.

Steps to check:

• Verify correct hose connections: Ensure the hot hose is connected to the hot inlet and the cold hose to the cold inlet on the washer. Misconnection can cause some Samsung models to throw 4C.
• Check water pressure: Disconnect one hose and briefly open the valve into a bucket. A weak trickle indicates a plumbing issue that must be resolved before the washer can operate correctly.
• Clean inlet screens: Remove and rinse the mesh filters in the inlet ports to clear rust or mineral buildup.
• Test solenoids: With power disconnected and top cover removed, visually inspect the water inlet valve assembly for signs of burning or cracking. If you have a multimeter and skills, you can test coil resistance against Samsung specs.

When to stop: If water supply and screens are fine but 4C persists, the inlet valve assembly or main PCB may be faulty. Replacement is a moderate repair; consider a professional if unsure.