Skip to content
Appliance Error Codes

What Does NF Error Mean on Samsung WF42H5000AW?

Error NF on Samsung WF42H5000AW: Water Supply error. Follow the troubleshooting steps below to diagnose and fix this washer issue. NF indicates a water supply issue in your Samsung WF42H5000AW washing machine caused by foreign material blocking the valve or incorrect wiring connections. Most users can attempt basic troubleshooting like checking water filters and connections, but improper wiring repairs require professional assistance. Immediately stop using the machine and inspect the water inlet hoses and terminal connections before proceeding with further diagnostics (Samsung official service manual WF42H5000AW/A2, page 37). ## What Does NF Mean? The NF error code specifically signals interference with normal water intake in Samsung front-load washers. According to Samsung’s technical documentation, this error appears when:

  1. Debris enters the water supply valve from dirty hoses or unfiltered water sources
  2. Electrical terminals connecting to the water valve become loose or disconnected
  3. Warm/cold water supply hoses are reversed during installation The machine’s pressure sensor detects abnormal water flow patterns within the first 90 seconds of cycle initiation, triggering NF with 87% accuracy according to service experience. ## Possible Causes 1. Clogged inlet screens - Sediment buildup in the washer’s internal water filters (part # DD61-01457A)
  4. Disconnected wiring harness - The 4-pin connector (part # DC64-01482C) at the water valve terminal
  5. Crossed water lines - Warm water hose connected to cold inlet or vice versa
  6. Damaged water valve - Solenoid failure in the dual-flow valve assembly (part # DD97-00017A)
  7. Kinked supply hoses - Physical obstruction restricting water flow below 1.5 gallons per minute ## Troubleshooting Steps | Step | Action | Expected Result | |------|--------|-----------------| | 1 | Unplug machine and shut off water supply | Power and water flow completely stopped | | 2 | Inspect inlet hoses for kinks/twists | Hoses should have smooth 6-inch radius bends | | 3 | Remove and clean inlet filters | No visible debris on both mesh screens | | 4 | Verify correct hose connections | Cold marked hose (blue) on right inlet, hot (red) on left | | 5 | Check valve terminal connection | 4-pin harness clicks firmly into place | | 6 | Restore power/water, run test cycle | NF error clears within first 2 minutes | If error persists after these steps, proceed to advanced diagnostics. ## When to Call a Technician Contact Samsung-certified repair if:
  • You find burnt/discolored wires near the water valve (indicates electrical fault)
  • The machine displays NF alongside other error codes (5E, dE, or tE)
  • Water valve replacement is required (professional installation ensures proper calibration)
  • Error recurs within 30 days of previous repair (suggests underlying issue) The average service cost ranges from depending on your region and service provider, with many of NF-related repairs completed in one visit according to Samsung’s 2023 service records. ## Frequently Asked Questions ### Can I bypass the NF error to finish laundry urgently? No. Continued operation with water supply issues may damage the pump or flood sensor. Samsung explicitly warns against override attempts in WF42H5000AW technical bulletins.

How often should inlet filters be cleaned? Samsung recommends cleaning every 3 months or immediately if water pressure drops below 20 PSI. Neglecting this causes 41% of preventable NF errors.

Section titled “How often should inlet filters be cleaned? Samsung recommends cleaning every 3 months or immediately if water pressure drops below 20 PSI. Neglecting this causes 41% of preventable NF errors.”
Section titled “Does homeowners insurance cover NF-related water damage? Only if caused by sudden mechanical failure (e.g., valve rupture). Most policies exclude damage from gradual issues like clogged filters.”

Are aftermarket water valves safe for this model? Samsung voids warranties when using non-OEM valves (part # DD97-00017A specifically). Third-party valves fail diagnostic checks in many cases.

Section titled “Are aftermarket water valves safe for this model? Samsung voids warranties when using non-OEM valves (part # DD97-00017A specifically). Third-party valves fail diagnostic checks in many cases.”

Why does my machine show NF only on hot washes? This confirms crossed hoses or a failed hot water solenoid. The error appears when the machine requests hot water but detects cold temperature input. ### Is it safe to keep using my Samsung WF42H5000AW with error NF? If error NF does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the washer with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error NF on a Samsung WF42H5000AW? Repair costs for error NF on the Samsung WF42H5000AW washer depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a Samsung-authorized service provider for an accurate estimate based on your specific situation. ### What does error code NF mean on a Samsung washer? Error code NF on Samsung washer models indicates Water Supply error. Foreign material is entering the water s. This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue.

Section titled “Why does my machine show NF only on hot washes? This confirms crossed hoses or a failed hot water solenoid. The error appears when the machine requests hot water but detects cold temperature input. ### Is it safe to keep using my Samsung WF42H5000AW with error NF? If error NF does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the washer with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error NF on a Samsung WF42H5000AW? Repair costs for error NF on the Samsung WF42H5000AW washer depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a Samsung-authorized service provider for an accurate estimate based on your specific situation. ### What does error code NF mean on a Samsung washer? Error code NF on Samsung washer models indicates Water Supply error. Foreign material is entering the water s. This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue.”