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Error code reference

Samsung Washer Error Code nF1

Water supply error caused by foreign material in water supply valve, disconnected valve terminal, incorrectly…

Samsung codesSamsung washer codes

Water supply error caused by foreign material in water supply valve, disconnected valve terminal, incorrectly switched warm water and rinse connectors, or disconnected PCB terminal from drain hose to detergent drawer.

First step from the service manual

Check the resistance for the water supply valve (0.9 kΩ to 1.2 kΩ between terminals) and check for foreign material in the diaphragm and filter.

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

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What nF1 means on a Samsung washer

The nF1 error code on a Samsung washer indicates a water supply error, meaning the machine is not receiving adequate water flow during a cycle. The primary components involved are the water supply valve assembly, the wiring harness connectors leading to the valve, and the PCB (main control board) terminal connections. The washer's control system monitors incoming water fill rates and triggers this code when flow falls below expected thresholds within a set time window.

The most common root causes include foreign material lodged in the water supply valve diaphragm or inlet filter screen, which restricts or completely blocks water from entering the drum. A disconnected or corroded valve terminal will prevent the solenoid from opening the valve at all. Wiring errors, specifically having the warm water and rinse connectors switched, can also confuse the control system and produce this fault. Additionally, a disconnected PCB terminal on the path from the drain hose to the detergent drawer can disrupt signal continuity and trigger the error.

Diagnosis begins with a resistance check across the water supply valve terminals. A properly functioning valve should read between 0.9 kΩ and 1.2 kΩ. Readings outside this range indicate a failed solenoid coil requiring valve replacement. If resistance checks out, physically inspect the valve diaphragm and inlet filter for debris such as sediment, rust particles, or mineral deposits. Connector positions for warm water and rinse supply lines should also be verified against the labeled ports to rule out a wiring swap.

Source: manufacturer service documentation.

Common causes of nF1

  1. 01

    Foreign material in water supply valve

    Wiring / connection

    Sediment, mineral deposits, or debris can clog the diaphragm or filter screen inside the water supply valve, restricting water flow. Inspect and clean the inlet filter screen and diaphragm to restore normal fill.

  2. 02

    Failed water supply valve solenoid

    Part replacement

    If the valve solenoid coil has failed, it will not open to allow water in. Test resistance across the valve terminals and replace the valve if the reading falls outside the 0.9 kΩ to 1.2 kΩ specification.

  3. 03

    Disconnected or loose valve terminal

    Wiring / connection

    A disconnected wiring terminal at the water supply valve prevents the solenoid from receiving the signal to open. Inspect all connector pins at the valve for secure seating and signs of corrosion.

  4. 04

    Warm water and rinse connectors swapped

    Wiring / connection

    If the warm water and rinse supply connectors are switched during installation or servicing, the washer may not fill correctly and will generate this fault. Verify each connector is attached to its correctly labeled port.

  5. 05

    Disconnected PCB terminal from drain hose to detergent drawer

    Wiring / connection

    A loose or disconnected PCB terminal on the wiring path between the drain hose and detergent drawer can interrupt control signals and trigger the nF1 error. Trace the connector and reseat it firmly.

See the test procedure for each cause

Frequently asked questions about nF1

What does nF1 mean on a Samsung washer?
The nF1 code on a Samsung washer signals a water supply error. The washer is not filling with water at the expected rate or volume. Causes include a clogged water supply valve, a disconnected wiring terminal, swapped supply connectors, or a loose PCB terminal connection.
How do I fix the nF1 error on my Samsung washer?
Start by checking the inlet filter screen and valve diaphragm for debris and clean them if needed. Then test the water supply valve resistance, which should read between 0.9 kΩ and 1.2 kΩ across the terminals. Also verify that all wiring connectors at the valve and PCB are fully seated and that the warm water and rinse hose connectors are connected to the correct ports. If the valve fails the resistance test, it will need to be replaced.
Will resetting my Samsung washer clear the nF1 error?
A reset may clear the code temporarily, but the error will return if the underlying cause is not corrected. The control system will trigger nF1 again as soon as it detects inadequate water fill in the next cycle. Address the root cause, such as cleaning the valve filter or reseating connectors, before relying on a reset.
Is it safe to use my Samsung washer when it shows nF1?
The washer will typically stop or refuse to complete a cycle when nF1 is active, which protects the machine from running without adequate water. It is best not to force or bypass the cycle since running the motor and drum without proper water fill can stress components. Diagnose and resolve the error before resuming normal use.
How much does it cost to repair a Samsung washer with the nF1 error?
If the fix is simply cleaning the inlet filter or reseating a connector, the repair may cost little to nothing beyond your time. If the water supply valve solenoid has failed and needs replacement, parts and labor can range from around 80 to 200 dollars depending on your location and whether you hire a technician. DIY valve replacement is a moderate-difficulty repair for those comfortable working with appliance wiring and water connections.

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