Samsung Washer 4C Error Code: What It Means and How to Fix It
Updated · from manufacturer service documentation
The 4C error code on a Samsung washer means the machine isn't getting water. The washer tried to fill, detected no incoming water, and stopped the cycle. In most cases the fix is simple — a closed faucet, a kinked fill hose, or a clogged inlet filter — and takes under 15 minutes without tools.
What Causes the 4C Code
| Cause | Likelihood | DIY difficulty | Related part |
|---|---|---|---|
| Water not reaching the washer (faucet closed, low pressure, frozen pipes or valve in winter) | Most common | Easy — no tools | — |
| Fill hose kinked or blocked | Common | Easy — no tools | Fill hose |
| Debris in the water inlet valve filter | Common | Easy — pliers, 15 min | Inlet valve mesh filter |
| Hot & cold supply hoses connected to the wrong inlets | Occasional (after installation or moving) | Easy — swap hoses | — |
| Water inlet valve failed (electrical) | Less common | Moderate — multimeter | Water inlet valve assembly |
| Valve wiring terminal disconnected / broken wire | Less common | Moderate — access panel | Wiring harness |
| Main control board (PCB) relay fault | Rare | Pro repair | Main PBA |
How to Fix the 4C Error, Step by Step
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Confirm water is actually available
Open both faucets behind the washer fully. Check that other taps in the house have normal pressure. In winter, check whether the hoses or the valve area are frozen — thaw before anything else.
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Inspect the fill hoses
Pull the washer forward and make sure neither hose is kinked, pinched against the wall, or blocked.
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Clean the inlet valve filters
Turn off the faucets, unscrew the fill hoses from the back of the washer, and pull out the small mesh filters inside the inlet openings. Rinse off any debris and reinstall. This clears the most common physical blockage behind 4C.
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Check the hose connections
If the washer was recently installed or moved, make sure the hot hose goes to the hot inlet and the cold hose to the cold inlet. Swapped hoses trigger fill errors (Samsung uses a separate code, 4C2, when the water temperature at the inlet doesn't match what the cycle expects).
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Test the water inlet valve with a multimeter
Unplug the washer. Per Samsung's service documentation, the valve solenoid should read 0.9–1.1 kΩ between the terminals. A reading far outside that range means the valve has failed electrically — replace the valve assembly.
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Check the valve wiring
With the top/rear panel off, verify the connector on the inlet valve is seated and no wire is broken. A disconnected valve terminal produces the same 4C.
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If everything above checks out — control board
A faulty relay on the main PCB can stop the valve from opening. Board-level diagnosis is a job for a technician.
Which Models This Applies To
Documented for the Samsung top-load series WA48H7400AW, WA48J7700AW, WA48J7770AP, WA48J7770AW (per the series service manual). Samsung uses 4C as the water-supply code across current washer lines; older models show the same fault as 4E.
Related codes: 4C2 — wrong water temperature at the inlet (usually swapped hoses); 5C — the opposite problem, water won't drain. Full list: all Samsung washer error codes.
Frequently Asked Questions
Is it safe to keep using the washer with a 4C code?
The washer won't run the cycle until it can fill. There's no damage risk — the code is protective — but the load will sit unwashed until the water path is restored.
Why did 4C appear right after installing the washer?
Almost always installation-related: a faucet not fully opened, a kinked fill hose, or hot/cold hoses swapped at the inlets.
What's the difference between 4C and 4E?
Same problem, different generations. Newer Samsung washers display 4C; older models display 4E. The checks are identical.
How do I clear the 4C code after fixing the cause?
Press Power off, wait a few seconds, power back on and restart the cycle. The code clears once the washer detects incoming water.
Based on the Samsung service documentation for the WA48J7700AW washer series. Last updated: .