Error code 4C (or 4E / nF for “No Fill” on older Samsung models) signals a Water Supply Fault. When a cycle begins, the central control board commands the water inlet valve solenoids to open. If the electronic pressure frequency sensor does not detect the minimum required water volume within 8 minutes (or water level does not change within 4 minutes of valve activation), the machine pauses the cycle and sounds an alarm.
Step 1: Cleaning the Sediment Mesh Filter Screens
Over 75% of 4C error calls are resolved without purchasing any replacement parts. Hard water minerals and city water sediment accumulate against the fine nylon mesh screens seated inside the valve inlet threads.
- Turn off the hot and cold water shutoff valves behind the washer.
- Unplug the washer’s electrical power cord.
- Place a small bucket beneath the hose connections to catch residual water. Unscrew the hot and cold water supply hoses from the back of the washer.
- Look inside the threaded plastic valve fittings. You will see a Blue screen (Cold water) and an Orange/Red screen (Hot water).
- Use needle-nose pliers to gently grasp the plastic tab on each filter screen and pull straight out.
- Submerge the screens in white vinegar or scrub gently with an old toothbrush under running tap water until all sediment, rust, and calcium deposits are removed.
- Press the clean screens firmly back into their valve ports, reattach the hoses securely (hand-tight plus 1/4 turn with pliers), turn water faucets back on, and check for leaks.
Step 2: Multimeter Test on Samsung Water Inlet Valve Solenoids (1,000–1,400 Ω)
If the mesh filters are completely clean, adequate home water pressure is present (minimum 20 PSI required), but the washer only hums without dispensing water, test each solenoid coil using a digital multimeter.
| Valve Solenoid Test Point | Expected OEM Reading | Diagnostic Interpretation |
|---|---|---|
| Solenoid Coil Terminals (Cold 1, Cold 2, Hot) | 1.0 kΩ to 1.4 kΩ (1,000 Ω – 1,400 Ω) | PASS: Solenoid coil is intact. Check wiring harness or 120V AC trigger from PCB. |
| Open Circuit (O.L. or infinite resistance) | Infinite / Over 100k Ω | FAIL: Solenoid coil is burned out. The valve will never open. Replace valve assembly. |
| Short Circuit (0.0 Ω to 50 Ω) | 0.0 Ω to 50 Ω | FAIL: Shorted coil windings. May blow main control board triac. Replace valve assembly. |
OEM Replacement Part Information
Samsung Triple Water Inlet Valve Assembly
OEM Part Number: DC62-30312J (Replaces DC97-15459G, DC62-30314K, AP4342718, PS4208035)
Compatibility: Fits Samsung Front-Load and Top-Load Washers (WF42H5200AF, WF45K6200AW, WA50R5400AV, WA52M7750AW).
Installation Time: 20 minutes with a Phillips screwdriver and channel-lock pliers.
Connected Diagnostic Procedures & Next Steps
Water inlet delays can be triggered by false water frequency readings from the drain system. Check these connected diagnostic walkthroughs:
Frequently Asked Questions
Why does 4C appear only on warm or eco-warm cycles?
Samsung washers use separate solenoid coils for cold, hot, and bleach/softener dispensation. If only the hot water solenoid coil has burned out, pure cold cycles will run normally, but any warm or hot cycle will trigger 4C when the hot solenoid fails to energize.
Does low water pressure trigger 4C?
Yes. If your home water pressure drops below 20 PSI (or if a flood-safe auto-shutoff hose has tripped its internal check valve), flow rate will fall below 2.5 gallons per minute, causing the 8-minute fill timer to expire.
