Samsung Dishwasher 4C error code

The dishwasher is not getting water at the pressure or temperature it needs, so it cannot fill properly. The cycle stalls or never starts.

Also shown as: 4C, 4E

Last updated: October 6, 2026

Quick answer: Samsung dishwasher error code 4C: water supply error. The most common cause is water supply valve under the sink is closed or partially closed. Try this first — open the water supply valve fully. If that does not clear it, straighten the inlet hose.

What causes the 4C error?

  • Water supply valve under the sink is closed or partially closed
  • Kinked or crushed inlet hose
  • Low household water pressure
  • Clogged inlet filter screen
  • Floodsafe auto-shutoff hose tripped (Samsung does not support these)
  • Failed water inlet valve

How to fix Samsung 4C — step by step

Work through these in order, from simplest and safest first. Stop as soon as the code clears.

  1. Open the water supply valve fully
    Find the hot-water valve under the sink that feeds the dishwasher and turn it fully open. A partially closed valve is the most common cause of 4C.
  2. Straighten the inlet hose
    Pull the dishwasher out slightly (if accessible) or check under the sink for a kinked or flattened inlet hose. Straighten any kinks so water flows freely.
    Safety warning: Turn the water valve off before disconnecting any hose.
  3. Remove Floodsafe hoses
    If your inlet hose has a Floodsafe auto-shutoff fitting, replace it with a standard braided hose. Samsung states its dishwashers are incompatible with Floodsafe hoses, which can trip and starve the machine.
  4. Check household water pressure
    Run a nearby faucet - if flow is weak everywhere, the problem is your home's supply, not the dishwasher. Normal pressure should fill the tub within a few minutes of the cycle starting.
Related guide: Dishwasher troubleshooting — fix common problems, with links to every dishwasher error code we cover.

When to call a technician

Stop and call a qualified technician if any of these apply:
  • 4C persists with the valve open and good pressure
  • The inlet valve needs testing or replacement
  • The inlet filter screen is damaged
  • The main control board is not opening the valve

Frequently asked questions

The valve is open but 4C persists. What next?

Check the inlet filter screen where the hose meets the dishwasher - sediment clogs it. If that is clean, the inlet valve itself may have failed and needs a technician.

Can 4C appear if the water is too cold?

Yes. Samsung's 4C covers pressure and temperature - water that is far too cold or too hot for the cycle can trigger it alongside low pressure.

Was the dishwasher working before a plumbing job?

Plumbers often leave the supply valve closed or partially closed. Check it first - it is the classic post-plumbing 4C.

Sources

Every meaning and fix above was checked against official manufacturer documentation:

FixCode provides general troubleshooting information only — not professional repair advice. If you are unsure about any step, stop and call a qualified technician. Repairs done incorrectly can be dangerous and may void your warranty.

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