Samsung nF Error Code — What It Means
The nF error code (sometimes displayed as NF, 4C, 4E, or 1 4C) indicates a not-filling fault. Your Samsung washer is not receiving enough incoming water to run the cycle correctly. The control board expects the tub to fill within a specific time window, and when water does not enter fast enough or at all, it halts the cycle and displays this code. This is an inlet or supply problem, not a drain issue. Samsung’s service documentation treats all these code variations as part of the same water-inlet fault family, so troubleshooting focuses on the path from your home’s water supply to the washer valve.
Common Causes
- Closed or partially closed supply valves Both hot and cold shut-off valves at the wall must be fully open for the washer to fill at the correct rate.
- Kinked or pinched inlet hoses The fill hoses can become crushed behind the washer or bent sharply during installation, restricting water flow.
- Clogged inlet mesh screens Small filters inside the hose connections at the back of the washer trap sediment and debris over time, blocking water flow.
- Reversed hot and cold hose connections If hot and cold lines are swapped, or a hot line is missing on models that require both, the control may not detect proper fill.
- Drain hose installation problems A drain hose inserted too deep into the standpipe or forming an airtight seal can interfere with the fill cycle and trigger the error.
- Failed inlet water valve assembly When supply, hoses, and filters are all correct but the washer still will not fill, the solenoid valve itself has likely failed and cannot open.
Step-by-Step Fix
- Verify both supply valves are turned fully counterclockwise to the open position and confirm water pressure is present at the wall outlets.
- Inspect both inlet hoses for kinks, sharp bends, or physical damage, and trace each line to confirm hot connects to hot and cold connects to cold.
- Shut off water, disconnect hoses, and use a small brush or pick to clean the mesh screens visible inside the inlet ports on the back of the washer.
- Check the drain hose installation and confirm it is inserted not less than 6 inches and not more than 8 inches into the standpipe, and does not form an airtight seal.
- Remove and clean the dispenser drawer if any detergent buildup or debris is visible in the drawer housing.
- Power-cycle the washer by unplugging the unit or switching off the circuit breaker for at least one minute, then restore power and retest the cycle.
- Test and replace the inlet valve assembly if all external checks pass but the washer still does not fill, using a multimeter to confirm the valve coil and verifying mechanical operation when energized.
Parts Often Needed
| Part | Notes |
|---|---|
| Water inlet valve assembly | Amazon | Hot or cold side, depending on test results. Confirm your model number before ordering. |
| Washer inlet hose set | Amazon | Replace if kinked, damaged, or incorrectly routed. Samsung advises against Flood Safe hoses for troubleshooting. |
| Inlet mesh screens / filters | Amazon | Usually cleaned rather than replaced, but order new screens if damaged or missing. |
When to Call a Pro
Call a qualified appliance technician if you have verified full water pressure at the wall, cleaned all screens, confirmed correct hose routing and drain installation, and power-cycled the washer but the nF code still appears. Inlet valve replacement requires accessing internal components, disconnecting electrical connectors, and working with water lines under pressure. If you are not comfortable with multimeter testing or disassembling the cabinet, professional diagnosis will identify whether the valve, pressure sensor, or control board is at fault and make sure the correct part is replaced the first time.