How to Fix Samsung Washer 4C 4E NF Error Codes- Technician’s Guide 2026

Is your Samsung washer flashing a 4C, 4E or NF error? This guide covers the most common causes, from kinked hoses to clogged mesh filters, and provides step-by-step DIY fixes to get your laundry back on track. A Samsung washer can only work correctly if it receives a steady supply of water. So, if the machine is displaying a 4C error code, that means there’s a problem with that water supply or pressure and it cannot function properly.

Quick Fixes for 4C, 4E, NF error code on Samsung Washer

• Check the Water Supply: Ensure your home’s water taps are turned on fully.
• Inspect Hoses: Look for kinks or bends in the cold and hot water inlet hoses.
• Clean the Mesh Filters: Unscrew the hoses from the back of the washer and clean the small mesh screens of any sediment or debris.
• Clear the Dispenser: Ensure there is no detergent buildup or blockage in the dispenser drawer.
• Update the app (new models): Check the SmartThings app for pending updates. The washer might display intermittent codes until sensors are recalibrated.
• Test the washer by running a basic rinse/spin cycle. Listen carefully at the beginning of the cycle to make sure the washer is filling with water. The error code should clear on its own.
• Perform a hard reset (below) to clear any remaining codes.

Samsung Codes Used Interchangeably

• 4C is the standard code for all Samsungs with LED/LCD displays. It means Water Supply Error.
• 4E is found on older model Samsung displays. It still means Water Supply Error.
• NF or 1C code is often seen on top-load models or high-end AI machines. It means no fill or sensor issues.

What The 4C Code Means On A Samsung Washer

This error code will get triggered when water does not flow into the machine quickly enough. The most likely reason behind this is that the water pressure or flow rate is too low. Ideally, the incoming water pressure must be between 0.5 and 8 bar for the washing machine to work optimally.

Verify the Incoming Water Supply

Before dismantling your washer, ensure the issue isn’t coming from your home’s plumbing. The 4C error triggers when water pressure drops below 0.5 bar, preventing the machine from filling within the allotted time.

• Common Causes: * Closed Taps: The water supply valves behind the washer aren’t fully open.
  • Household Issues: A general water outage or a leak elsewhere in the house.
  • Frozen Pipes: In winter, the lines leading to the laundry room may be frozen, blocking all flow.
• The Fix: * Check Other Faucets: Open a nearby sink to confirm you have strong water pressure.
  • Check the Valves: Ensure both hot and cold taps are turned fully counter-clockwise.
  • Thaw Frozen Lines: If the pipes are frozen, use a hairdryer on a low setting to gently warm the exposed pipes until flow is restored.

Related Read: Samsung Washer Leaking- How to Fix It?

Blocked Or Kinked Water Supply Hose

If your Samsung washer isn’t filling, the issue often lies in the water supply hoses connecting the wall taps to the machine. These flexible hoses can become kinked or pinched if the washer is pushed too close to the wall, or they can become internally blocked by sediment over time. To fix this, pull the washer out slightly and inspect the hoses for any sharp bends or flat spots. If the hoses look clear but water flow is still weak, turn off the taps, disconnect the hoses, and flush them out in a sink to ensure there is no hidden debris triggering that frustrating 4C error code.

Dirty Water Inlet Mesh Filters

• What it is: Small mesh screens located inside the water inlet valves at the back of the washer. They catch sediment and debris from your home’s water pipes before it enters the machine.
• The Problem: Over time, these filters become “choked” with mineral buildup or grit, restricting water flow and triggering the 4C error code.
• The Fix: 1. Turn off the water taps and unscrew the hoses where they attach at the back of the washer. Keep towels underneath for drips. 2. Use needle-nose pliers to gently pull the plastic mesh filters out of the inlet valves. 3. Scrub them clean under a faucet and reinstall.
• Pro-Tip: Perform this maintenance twice a year to prevent “ghost” 4C errors, especially if you have hard water or older plumbing.

On newer Bespoke models, the mesh filters are often deeper inside the inlet valve than on older units. Use needle-nose pliers to access, as the newer screens are seated further back and cannot be easily pulled out with fingers or tweezers like older models.

AI-Powered Smart Check & Firmware Updates

Newer models use more sensitive pressure sensors that can sometimes misread a minor pressure drop as a total failure.

• The Issue: A “ghost” 4C code caused by over-sensitive sensor calibration in the firmware.
• The Fix: Check the SmartThings app. If an update is pending, the washer might display “dn” or “AS”. Updating the firmware can recalibrate the water level sensors and stop intermittent 4C errors.

Siphoning from Incorrect Drain Hose Height

While this is a general issue, it is the #1 cause of intermittent 4C codes on new high-efficiency (HE) installs.

• The Issue: If the drain hose is inserted too far into the standpipe (more than 6-8 inches) or is too low, the water siphons out as fast as it comes in. The washer’s AI sees that the water level isn’t rising and assumes the supply is blocked, throwing a 4C code.
• The Fix: Ensure the hose is using the plastic U-guide and is not pushed deep into the drain pipe.

Blocked Detergent Dispenser Drawer

How it fails: After a long time in use, the detergent dispenser drawer can get blocked. Typically, this happens due to a buildup of excess detergent that gradually becomes more significant over time. At some point, the blockage can become severe enough to affect the water flow into the drum, triggering the 4C error code.

How to fix: Remove the dispenser drawer from its housing. Check for any foreign objects or buildups that could obstruct water flow. Clean the drawer thoroughly under the kitchen tap and wipe it dry. Slide the drawer back into its housing.

The Auto-Dispense Tank Clog (Specific to New Models)

Many 2024-2026 Samsung washers feature an Auto-Dispense drawer for detergent and softener.

• The Issue: If the detergent in the tank becomes too thick or “gels,” it creates a backup in the dispenser housing. On newer AI models, the machine may interpret a dispenser blockage as a water supply issue, triggering the 4C code.
• The Fix: Remove the entire drawer, take out the blue detergent/softener tanks, and flush the internal housing with warm water to clear any hardened soap.

How To Reset A Samsung Washer?

To reset a Samsung washing machine, follow these steps:

1. Unplug your washer completely from the outlet, or turn off the dedicated circuit breaker at your main electrical box.
2. Wait for one to five minutes as the washer discharges any electrical charge it’s retaining.
3. Power the washing machine up by reconnecting its plug to the wall socket or turning on the dedicated circuit breaker.

How To Enter Diagnostic Mode?

After you’ve addressed the problem and reset your Samsung washer, you might want to confirm that the 4C error code has indeed been cleared. You can do this by entering the washer’s diagnostic mode to check if the 4C or other error codes are still registering in the washer.

To enter diagnostic mode on your Samsung washer, follow these steps:

1. First, start with the washer turned on. Then, press and hold the Delay Start and Soil Level buttons. The buttons might differ depending on your Samsung washer model, so please confirm by checking the user manual.
2. Next, keep holding those buttons until you see all zeros on display and hear a chime.
3. Then, press the Soil Level button until the letter D appears on display. That means the machine has entered the error code diagnostic mode.
4. At this point, you can turn the jog dial to cycle through however many codes the machine has to show. Once you’ve reached the letter D on display, that means you’ve viewed all current error codes (if any).

Common Samsung Washer Error Codes

Click on the link for additional information specific to clearing each code.