Samsung Error Code 4C: What It Means and How to Fix

The 4C error on Samsung washing machines means the machine isn’t filling with water fast enough, or at all. In most cases, a kinked hose, a closed tap, or clogged inlet filters cause it. Start by checking your water supply — that fixes 90% of 4C issues without opening the machine.

The Fastest Diagnostic Path (6 Checks in 5 Minutes)

Before pulling tools or running any test cycles, confirm each of these items. Every check takes seconds and eliminates the most common causes.

• [ ] Both hot and cold water taps are fully open (counterclockwise until they stop)
• [ ] Inlet hoses are not kinked, pinched, or twisted behind the machine
• [ ] Inlet filters (small screens where hoses connect to the washer) are clean
• [ ] The washer is not sharing a line with a fixture that draws water simultaneously (e.g., a toilet flush during fill)
• [ ] Household water pressure is adequate – other faucets run at normal speed
• [ ] The machine was unplugged for at least 10 minutes after the error appeared (clears board glitches)

If any check fails, address it before assuming a part is broken.

First Check: Water Supply and Hoses

Before running any test cycles or pulling out tools, confirm these four things. Each is a five-second check that could save you an hour.

• Are both hot and cold taps fully open? If your machine only uses cold water, the hot tap might be closed but still not trigger a separate error. Open both to full.
• Are the inlet hoses kinked or pinched? The rubber hoses behind the washer often get bent when you push the machine back against the wall. Straighten them so water flows freely.
• Is the water supply turned off at the main? If you recently did plumbing work, the whole house supply might be partially closed.
• Are the inlet filters clogged? Small screens where the hoses connect to the washer catch sediment. Over time they block, cutting flow. We’ll clean those in the next section.

Common Causes at a Glance

Cause	Symptom	Quick Check	Fix
Kinked hose	Machine starts fill, then error after 10 seconds	Visually trace each hose	Straighten hose, ensure no twists
Clogged inlet filter	Slow fill, then 4C after 2 minutes	Disconnect hose and look at screen mesh	Clean with toothbrush and water
Low household water pressure	Intermittent 4C during peak usage hours	Test other faucets for flow	Install pressure booster or schedule wash outside peak hours

Ordered Quick Fixes for Samsung Error 4C

These steps progress from the simplest to the slightly more involved. Don’t skip ahead — each step solves a distinct failure mode.

Step 1: Open Both Water Taps Fully

Turn each tap counterclockwise until it stops. Common mistake: thinking a quarter-turn is enough. Most Samsung washers need full pressure. If you have individual shutoffs behind the washer, make sure they’re not partially closed.

Step 2: Inspect and Straighten Inlet Hoses

Pull the washer out enough to see the full length of each hose. Look for sharp bends, loops, or spots where the hose touches the wall. Common mistake: only checking the visible front. Hoses often kink behind the machine where you can’t see them until you pull it out. Straighten any bends and re-secure the hose.

Step 3: Clean the Inlet Filters

Turn off the water taps. Disconnect each hose from the back of the washer (not from the tap side). You’ll see a small plastic screen inside the fitting. Remove any debris with a small brush or toothpick. Flush the screen under running water. Reconnect hoses tightly by hand, then a half-turn with pliers.

Common mistake: over-tightening and cracking the plastic fitting. Hand-tight plus a gentle extra turn is enough. Checkpoint: after reconnecting, open the taps briefly to flush any loose sediment before running a cycle.

Step 4: Reset the Washer

Unplug the machine (or flip the breaker) for 10 full minutes. Plug back in, select a rinse-only or small load cycle, and start it. This clears temporary board glitches that can mimic a water fault. If the error disappears, you’re done. If it returns, move to Step 5.

Step 5: Measure Fill Time and Decide Your Next Move

Run a test cycle and time how long the machine takes to reach the wash level. A healthy fill takes under 3 minutes. If it takes longer, your home’s water pressure may be below the machine’s minimum requirement (typically 20 psi). Common mistake: assuming the tap delivers full pressure when other faucets run slowly. Use a pressure gauge on an outdoor spigot if you’re unsure.

Realistic branch: After Step 5, if the fill time is over 3 minutes but you already cleaned the filters and checked hoses, the next action depends on whether the flow is consistently slow or intermittent. If it’s consistently slow during every wash, the water inlet valve is likely failing – proceed to the internal component section. If it’s intermittent (e.g., only during peak morning hours), the problem is household water pressure – install a pressure booster or shift wash times. Do not replace the valve for intermittent slow fills; you’ll waste money and still see the error.

According to Samsung’s official error code documentation, the 4C code appears when the machine detects less than 2 liters of water entering within 2 minutes. Once the water supply is restored, the code should clear automatically or after a reset.

When the Fix Isn’t Simple: Internal Component Failure

If all the above checks pass and the 4C error continues, the problem is inside the machine. The most common hidden failure is a stuck or sluggish water inlet valve. This solenoid-operated valve clicks open when the board sends power. Over time, mineral deposits or debris can jam the plunger, restricting water flow.

How to detect it early: Listen during the fill cycle. A healthy valve makes a single clear click when the cycle starts. If you hear a rapid clicking, a buzzing, or no click at all, the coil may be failing. Another early sign is the machine filling slower than usual over the last few washes — that slow creep often precedes a full 4C lockout.

To confirm, you can test the valve with a multimeter. Disconnect power, remove the top panel, and measure resistance across the valve terminals. A good valve reads between 500 and 1500 ohms. An open circuit (infinite resistance) means the coil is dead. At this point, replacement is the only fix. Understanding the 4c error code on samsung washing machines will walk you through the part numbers and swap procedure.

If the valve tests fine, the control board or wiring harness may be at fault — a job for a qualified technician. A less common failure is a clogged water pressure hose leading to the pressure switch; you can check this by blowing air through it – if it’s blocked, replace it.

Success Check and When to Stop Troubleshooting

Run a full wash cycle with a small load. Verification step: Watch the water fill. When the cycle starts, you should see a steady stream entering the detergent drawer within 10 seconds. The machine should reach the wash level in under 3 minutes without pausing. If the 4C error does not appear, the fix worked. Stop here — no further action needed.

Stop DIY and call a repair technician if:
– The error appears immediately after you turn on the tap, before any fill attempt.
– You’ve cleaned filters, checked hoses, and tested the valve, and the code persists.
– You smell burning or hear unusual buzzing from the control board area.

Pushing further risks flooding or electrical damage. For a deep dive on reset procedures, see our guide on how to reset samsung washer after error code. If the error reoccurs weekly despite stable pressure, the inlet valve is likely dying and should be replaced.

Frequently Asked Questions about Error 4C

Can error 4C appear even if water comes into the machine?
Yes. The machine measures flow rate, not just presence. If water trickles in too slowly, the board times out and shows 4C even though the drum isn’t dry.

Will a power outage cause error 4C?
Not directly. A power outage can corrupt the board’s memory, but the resulting error is usually a generic code like 5E or a blank display. If you see 4C after a blackout, start with the reset step (unplug 10 minutes) before checking hoses.

Do I need to replace both inlet valves if one fails?
No. Each valve controls a separate water temperature. Replace only the faulty one. However, if the machine is over 8 years old, replacing both as a pair is cheap insurance against a second failure.

Is error 4C covered under Samsung warranty?
Yes, if the machine is under 1 year old (or 2 years on some models) and the cause is not a kinked hose or blocked filter. Water pressure issues and user error are excluded. Check your warranty terms before calling a Samsung technician.

For a broader look at error code patterns, see our article on understanding the 4c error in samsung washing machines.