Samsung · Dishwasher Moderate

4C — / 4E — Water Supply Error

The 4C (older 4E) code means the dishwasher is not getting water at the expected rate during fill.

Keep using it?
Yes, with caution
DIY difficulty
Easy
Verified against
samsung.com ↗

How to fix it

  1. Confirm the under-sink supply valve is open with good pressure.
  2. Clean the inlet valve screen.
  3. Test and replace the inlet valve if needed.

Why it happens

Typical signs: Dishwasher will not fill · Cycle stalls at the start · 4C or 4E on the display

  • Supply valve closed or low pressure The under-sink supply must be fully open.
  • Clogged inlet screen Sediment in the inlet valve mesh.
  • Faulty inlet valve A valve that will not open.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • Samsung Dishwasher Water Inlet Valve Common replacement
    Amazon →

Related repair guides

Dishwasher Not Filling With Water — Causes and Fixes →

More Samsung dishwasher codes

1C 1C — Low water level / fails to start 1E 1E / IE — Filter clogged / heater fault 3C 3C Error — Wash Pump Failure 3E 3E — Hot water supply too hot 4C5 4C5 / 4E5 — Fill timeout with dry tub 5C 5C / 5E — Drain Error

All Samsung codes → All dishwasher codes →

Frequently asked questions

What does the 4C code mean on a Samsung dishwasher?

The 4C (older 4E) code means the dishwasher is not getting water at the expected rate during fill.

What causes the 4C code on a Samsung dishwasher?

Supply valve closed or low pressure: The under-sink supply must be fully open. Clogged inlet screen: Sediment in the inlet valve mesh. Faulty inlet valve: A valve that will not open.

Is it safe to keep using a Samsung dishwasher with a 4C error?

Yes, with caution. This is rated a moderate-severity fault.

How do I fix 4C on a Samsung dishwasher?

Confirm the under-sink supply valve is open with good pressure. Clean the inlet valve screen. Test and replace the inlet valve if needed.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: samsung.com.