Samsung washer — Error Code 4C

A water supply timeout notification signaling the drum is failing to fill as expected.

What it means

The 4C error code (often seen as 4E on legacy Samsung units) triggers when the main control board determines the machine isn't filling with water within the allotted timeframe. Specifically, the pressure sensor (water level switch) fails to detect the required frequency shift—signaling that water is rising in the tub—within a 4 to 6-minute window after the water inlet valve is activated. This safety timeout exists to protect the inlet valve solenoids from overheating and to prevent the unit from running a cycle without water, which could lead to internal damage. The issue usually stems from household water restrictions, electrical failure within the inlet valve solenoids (such as an open coil), a clogged or leaking pressure switch hose, or a malfunction in the main PCB's triac responsible for delivering 120VAC to the valve. Effective diagnosis involves distinguishing between mechanical water flow blockages and electrical actuation failures.

Likely Causes

1

Clogged Inlet Valve Screens

Sediment and hard water deposits—common in parts of Eastern Washington—can obstruct the mesh filters inside the water inlet valve, significantly reducing flow.
2

Defective Water Inlet Valve

The solenoid coils on the inlet valve may fail electrically. If a multimeter shows open or infinite resistance, the valve will not open to permit water intake.
3

Closed or Restricted Supply Valves

Ensure your home water supply valves are fully open; also, check that inlet hoses behind the unit aren't kinked or crushed, which is common if the washer was recently moved.
4

Faulty Pressure Switch or Hose

If the air dome hose has a pinhole leak or is blocked by detergent buildup, the pressure switch cannot correctly read the water level, leading to a false timeout.
5

Main Control Board Failure

In rare instances, the main PCB fails to supply the necessary 120V to the inlet valve solenoids due to a shorted triac or a burnt electrical trace.

How to clear / reset

To perform a temporary reset of the 4C error, turn off the washer and unplug it from the wall for 3 to 5 minutes to clear the main control board's memory. Once plugged back in, start your cycle. Note that because 4C is an active diagnostic fault, the code will reappear immediately if the underlying issue—such as a closed water valve or a dead inlet solenoid—remains unaddressed. Always confirm your hot and cold water lines are fully open before attempting a reset.

Common replacement parts

Water Inlet Valve Assembly $45-95

Water Level Pressure Switch $30-65

Inlet Hoses $15-30

Main Control Board (PCB) $150-300 $150-300

When to call a pro

Contact a professional if basic checks, like inspecting hoses or cleaning inlet screens, fail to resolve the 4C error. Diagnosing a faulty water inlet valve requires using a multimeter to check solenoid resistance, and verifying PCB voltage output necessitates live electrical testing. If you suspect a damaged wiring harness or a failing main control board, let our technicians handle the job safely. A-Fix Service provides a $90 diagnostic (waived if you authorize the repair) and includes a 1-year parts and labor warranty on all work. Call (800) 200-2349.

FAQs

How much does it cost to fix a Samsung 4C error?

If the issue is simply a clogged filter, there is no cost. If the water inlet valve requires replacement, total repair costs (parts and labor) typically fall between $180 and $275.

Can I fix the 4C error myself?

Yes, provided the cause is a simple kinked hose, a closed supply valve, or a clogged mesh screen. Replacing the inlet valve or testing electrical components requires a multimeter and professional repair experience.

Will the 4C code clear itself once water is restored?

Usually, yes. Once water supply is restored and the machine detects the proper fill rate, the cycle will continue. If the machine entered a lockout state, a power cycle will clear it.

How long does it take a technician to fix this?

A standard water inlet valve replacement or pressure switch diagnostic typically takes one of our pros 30 to 45 minutes.

Will running the washer with a 4C code damage it?

The washer stops the cycle to protect itself. However, repeatedly attempting to start the cycle with a dry water supply can lead to overheating and permanent damage to the inlet valve solenoids.

Does a 4C error mean my control board is bad?

This is uncommon. In 90% of cases, the 4C code relates to a water supply issue or a failed inlet valve. The control board is only investigated if the valve tests properly but fails to receive voltage.

Need help with 4C?

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