Samsung Washing Machine Error Code 4C
Water supply not detected
The most common cause of the 4C error on a Samsung washing machine is water supply valve partially or fully closed (~40% of cases); start with: check the water supply valves.
What Does Error Code 4C Mean on a Samsung Washing Machine?
Water supply not detected.
The control board monitors the flow sensor and fill timing during the intake step. If water level fails to rise adequately within an expected window, it logs 4C (older units show 4E). Unlike a drain fault, 4C fires only during filling, and unlike leak-related codes it points to inadequate incoming flow. Both hot and cold supply are checked, so a single closed valve or clogged inlet screen can trigger it before the inlet valve solenoid is ever suspect.
What Causes Error Code 4C?
Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:
- 1 Water supply valve partially or fully closed 40% of cases
- 2 Kinked, pinched, or clogged inlet hose 30% of cases
- 3 Low water pressure from home supply (below 20 psi) 20% of cases
- 4 Faulty water inlet valve not opening fully 10% of cases
How to Fix Samsung Washing Machine Error Code 4C
- 1
Check the water supply valves
Locate the hot and cold water supply valves behind the washer. Turn both fully counterclockwise (open). Even a slightly closed valve can trigger a 4C error.
- 2
Inspect the inlet hoses
Pull the washer out and check both inlet hoses for kinks or bends. Straighten any kinks. Also check the mesh screens inside the hose connections — clean them if clogged with sediment.
🔩 Inlet hose screen filter - 3
Check home water pressure
Run a tap nearby. If pressure is low throughout the home, the issue is your supply, not the washer. Low pressure (below 20 psi) will trigger 4C.
- 4
Test and replace the water inlet valve
If all above checks pass, the water inlet valve solenoid may be stuck. Test continuity with a multimeter. Replace if no continuity reading.
🔩 Samsung water inlet valve ($25–$60)⚠️ Unplug the washer before accessing the inlet valve.
How to Reset Error Code 4C
Turn the washer off and back on. If the water supply issue is fixed, the code should clear. Alternatively, press and hold the Start/Pause button for 5 seconds to reset mid-cycle.
Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.
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When to Call a Professional
Call a technician if you have confirmed water supply is good (pressure OK, valves open, hoses clear) but the error persists — the control board or water inlet valve needs professional diagnosis.
Related Error Codes
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More Samsung Washing Machine Error Codes
Frequently Asked Questions
Can I keep using my Samsung Washing Machine when error 4C appears? +
What most commonly causes 4C on a Samsung Washing Machine? +
4C keeps coming back after a reset — what should I check next? +
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Sources & References
- • Samsung Support — Error Codes — official manufacturer documentation
- • Our editorial & verification policy
Content verified against manufacturer service documentation. Last verified: June 10, 2026.