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Error code reference

Samsung Washer Error Code nF

Water Supply Error

Samsung codesSamsung washer codes

Water Supply Error – water supply valve may be clogged with foreign material, water not supplied properly, fill hoses may be reversed, or water temperature sensed higher than 50°C in Wool or Lingerie cycle.

First step from the service manual

Check whether the water supply valve is clogged with foreign material and whether water is supplied properly. Check for reversed fill hoses.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What nF means on a Samsung washer

The nF error code on a Samsung washer indicates a Water Supply Error, meaning the machine has detected that water is not entering the drum correctly or within the expected timeframe. This error is tied to the water inlet system, which includes the fill hoses, the water supply valve (also called the inlet valve), and the temperature sensor monitoring incoming water. When the washer cannot confirm adequate water flow during a fill cycle, it triggers nF to halt the cycle and alert the user.

The most straightforward cause is a clogged water supply valve. Sediment, mineral deposits, or debris from the household water supply can accumulate in the inlet valve's mesh filter screens, restricting flow. Reversed fill hoses are another documented cause: if the hot and cold supply lines are connected to the wrong ports, the washer may detect incorrect water temperatures and register a fill error. This is especially relevant in Wool or Lingerie cycles, where water temperature is closely monitored. If the incoming water temperature exceeds 50°C during one of these delicate cycles, the nF code will also trigger as a protective measure.

Diagnosing nF involves checking several points in sequence. First, confirm that both hot and cold water supply valves at the wall are fully open and that water pressure is adequate. Next, inspect the inlet valve filter screens at the back of the washer where the hoses connect, cleaning out any debris. Verify that the fill hoses are connected to the correct ports, hot to hot and cold to cold. If physical checks pass and the error persists, the water inlet valve itself may have failed electrically and require replacement.

Source: manufacturer service documentation.

Common causes of nF

  1. 01

    Clogged inlet valve filter screens

    Wiring / connection

    Mineral deposits and debris from household water supply lines can block the small mesh screens inside the water inlet ports at the back of the washer, restricting water flow to the point where the fill cycle times out. Remove the fill hoses and inspect the screens for buildup, cleaning them with a soft brush if needed.

  2. 02

    Water supply tap closed or low pressure

    Wiring / connection

    If the hot or cold water shutoff valves behind the washer are partially or fully closed, the machine will not receive adequate water and will trigger nF. Confirm both valves are fully open and that household water pressure is sufficient.

  3. 03

    Reversed fill hoses

    Wiring / connection

    Connecting the hot supply hose to the cold inlet port or vice versa can cause the washer to detect incorrect water temperatures, leading to an nF error particularly in temperature-sensitive cycles like Wool or Lingerie. Check that the hose labeled or designated for hot water connects to the hot inlet and cold connects to cold.

  4. 04

    Incoming water temperature above 50°C in delicate cycles

    Wiring / connection

    During Wool or Lingerie cycles, Samsung washers monitor incoming water temperature closely. If the water entering the drum is sensed at above 50°C, the washer will stop filling and display nF as a protective measure. This can occur if water heater settings are very high or if the hoses are reversed.

  5. 05

    Failed water inlet valve

    Part replacement

    If the solenoid coils inside the water inlet valve fail electrically, the valve will not open even when the washer sends a signal to fill. This is typically the cause when hoses, screens, and water pressure have all been confirmed good and the error persists. Replacing the inlet valve is required to resolve this.

See the test procedure for each cause

Frequently asked questions about nF

What does nF mean on a Samsung washer?
The nF code on a Samsung washer stands for a Water Supply Error. It means the washer is not receiving water properly during the fill phase of the cycle. Common triggers include a clogged inlet valve filter screen, closed water supply taps, reversed hot and cold hoses, or water entering at a temperature above 50°C during a Wool or Lingerie cycle. Checking water supply connections and inlet screen cleanliness is the recommended starting point.
How do I fix the nF error on my Samsung washer?
Start by confirming that both the hot and cold water supply valves at the wall are fully open. Turn off the water, disconnect the fill hoses from the back of the washer, and inspect the small mesh filter screens inside the inlet ports for mineral buildup or debris, cleaning them if necessary. Also verify that the hot and cold hoses are connected to their correct ports. If none of these steps resolve the issue, the water inlet valve itself may have failed and will need to be replaced.
Is it safe to continue using my washer when the nF code is showing?
No, you should not attempt to run a wash cycle while the nF error is active. The code indicates that the washer has not filled with water properly, and running the machine without adequate water can stress the motor and pump components. Resolve the underlying water supply issue before resuming normal use.
How much does it cost to repair a Samsung washer showing nF?
If the fix is as simple as cleaning the inlet valve filter screens or correcting reversed hoses, there is no parts cost involved, only your time. If the water inlet valve has failed and needs replacement, parts typically range from $25 to $80 depending on the specific model, with professional labor adding another $75 to $150 if you hire a technician.
Will resetting my Samsung washer clear the nF error code?
Resetting the washer by unplugging it for a few minutes may temporarily clear the nF code, but the error will return as soon as the next fill cycle begins if the underlying cause has not been addressed. A reset is useful for confirming whether the issue is intermittent, but it is not a repair. You need to correct the water supply problem, such as cleaning the filter screens or fixing the hose connections, for the code to stay cleared.

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