Samsung Washer 4C Error Code – Meaning, Causes & Fixes
The 4C error code on a Samsung washing machine indicates a water supply problem — the machine is not receiving sufficient water within the expected time to begin or continue a wash cycle. It can appear at the very start of a cycle, seconds after you press Start, or shortly after the cycle has begun. The code is displayed as 4C on most Samsung models and as 4E on older ones — they refer to the same fault. The root cause is almost always on the supply side of the machine: a closed or partially closed water tap, a kinked inlet hose, or a clogged inlet filter mesh. All of these are quick fixes that require no tools and no technical knowledge. The internal water inlet valve is only rarely the culprit, and only once the simple external checks are confirmed clear.
What it means
Water supply error — the machine cannot fill with enough water to run the cycle.
Severity
LowCan you fix it yourself?
Yes — check water supply valve, hose, and inlet filter first.
Call a technician when
If the water inlet valve is faulty or the pressure sensor needs replacement.
What Does 4C Mean?
4C (or 4E) is Samsung's water supply fault code. When a wash cycle begins, the control board opens the water inlet valve and monitors the rate at which the machine fills. The pressure sensor (also called a water level sensor) tracks water level in the drum. If the machine cannot reach the minimum required water level within the expected fill time — typically 4–7 minutes depending on the cycle and model — the control board logs 4C and halts the cycle.
Samsung washers use two separate inlet valves: one for cold water and one for hot water. Depending on the cycle selected, one or both valves will open. On cold-wash-only cycles, only the cold inlet valve activates. 4C can be triggered by a problem on either the hot or cold supply line.
The fill system also includes a fine mesh filter screen at each hose connection point on the back of the machine. These screens prevent sediment and pipe debris from entering the valve. In areas with hard water or older plumbing, these screens accumulate mineral deposits and sediment surprisingly quickly — often within 1–2 years of use without cleaning. A partially blocked inlet screen is one of the most overlooked causes of 4C.
In rare cases, 4C can be caused by a failure of the water inlet valve solenoid itself — the coil that opens the valve when energized. However, this should only be suspected after the supply side has been fully checked and confirmed clear.
What Causes This Error?
- Hot or cold water supply tap is fully or partially closed — the most common and simplest cause; the tap may have been accidentally turned during cleaning or maintenance
- Kinked or bent inlet hose preventing water from flowing at the required rate — sharp bends near the wall connection are a frequent issue
- Clogged inlet filter mesh at the hose connection points — fine screens trap sediment and minerals over time and are rarely cleaned during routine maintenance
- Low household water pressure — Samsung washers require a minimum of approximately 0.5 bar (7 PSI) and generally work best at 1–8 bar; very low municipal water pressure can cause intermittent 4C
- Frozen inlet hose in cold weather — in unheated utility rooms or garages, the inlet hose or valve can freeze in winter
- Faulty water inlet solenoid valve that fails to open despite receiving the correct electrical signal from the control board
- Water pressure sensor (water level sensor) failure causing the machine to believe the drum is not filling when it actually is
How to Fix 4C
- 1
Check both water supply taps behind the machine. There should be two taps (hot and cold) — turn each one counterclockwise until it stops. Even a tap that is 90% open can restrict flow enough to cause 4C during high-demand fill phases. Make sure both are fully open.
- 2
Inspect both inlet hoses for kinks, tight bends, or pinching against the wall. Follow each hose from the tap connection all the way to the back of the machine. Straighten any bent sections and ensure the hoses have a gentle, flowing curve rather than any sharp angles.
- 3
Turn off the water supply taps. Place a towel under each hose connection at the back of the machine. Using pliers, unscrew each hose coupling from the machine (counterclockwise). At each connection point on the machine, you'll see a small mesh filter screen — remove it carefully with needle-nose pliers and rinse it under running water until the mesh is visibly clear.
- 4
Also check the filter screens at the tap end of the hoses — unscrew from the tap, check each screen, and clean if needed. Reconnect all hoses securely and restore water supply. Check each connection for drips before running a cycle.
- 5
Restart the machine on a Quick Wash or Rinse cycle. Stand next to the machine and listen — within the first 30–60 seconds, you should hear water flowing into the drum through the detergent drawer. If you hear nothing after 2 minutes, the inlet valve may not be opening.
- 6
If the machine fills and the cycle completes without 4C, run a second full cycle to confirm. If 4C returns, consider the timing: if it only occurs in cold weather, the hose or valve may be freezing; if consistent year-round, the inlet valve solenoid needs testing.
When to Call a Professional
If all supply-side checks pass and 4C persists, the water inlet valve inside the machine may have failed. This is a relatively accessible repair on most Samsung washers: the valve is mounted at the back of the machine, accessible after removing the rear panel. Each solenoid coil on the valve should show approximately 500–1,500 ohms resistance on a multimeter — an open reading indicates a failed coil. Replacement inlet valves for Samsung washers cost $30–$70; professional installation adds $80–$150 labor. The water pressure sensor (hose and chamber at the side of the drum) can also be tested for blockage by blowing gently into the sensor hose to confirm it is clear.
Can You Still Use the Device?
The machine will not proceed with a cycle while 4C is active — it will sit idle and display the code. There is no partial operation mode. Once you've resolved the supply issue and the code clears, the machine will operate normally. Run a short test cycle to confirm before loading a full wash.
See Also
Official Resources
Related Error Codes
Disclaimer: This article is for informational purposes only and does not constitute professional repair advice. CodeExplain is not affiliated with Samsung or any other brand mentioned. Always consult a qualified technician for complex repairs.