Samsung Dishwasher Error 4C: Water Supply Issue

The Logic Verdict

My Take: I reviewed the repair guide. The 4C error means the dishwasher is thirsty—it’s not getting water fast enough. Before you buy parts, check the simple stuff: run your kitchen sink until the water is hot (Samsung recommends ~120°F), and ensure the supply line isn’t kinked. The most common hardware fix is simply cleaning the mesh filter inside the water inlet valve.

What It Means

The 4C (or 4E) code stands for Water Supply Error. The machine detects that it hasn’t reached the correct water level within a set time.

Common Causes

1. Clogged Inlet Filter: Debris from your pipes blocking the screen on the water valve.
2. Water Supply Issues: Valve turned off, kinked hose, or low water pressure.
3. Faulty Water Inlet Valve: The solenoid has failed and won’t open.
4. Faulty Case Brake: The flow meter or overfill sensor inside the side tank (Case Brake) is reading incorrectly.

Step-by-Step Fix

1. Check Water Supply: Ensure the water supply valve under the sink is fully open. Run the hot water at the sink to purge cold water.
2. Inspect the Hose: Check the stainless steel supply line for kinks behind the dishwasher.
3. Access the Inlet Valve: Turn off the water and power. Remove the kickplate at the bottom front. The inlet valve is usually on the left or right side where the water line connects.
4. Clean the Filter:
   • Unscrew the water supply line from the valve (have a towel ready).
   • Look inside the valve’s threaded port. You’ll see a small mesh screen.
   • Pull it out with needle-nose pliers and rinse it under water. If it’s clogged with sediment, this is likely your problem.
5. Replace the Valve: If the filter is clean but the error persists, the valve itself may be bad. Remove the two screws holding it, disconnect the wire harness and the outlet hose, and swap in a new one.
6. Check the Case Brake: If the valve is good, the issue might be the “Case Brake” (a large plastic tank on the side of the tub). The video shows how to access and replace it if the overfill sensor inside fails (voltage test should show ~10.2V).

Parts & Tools

• Amazon Product (Amazon)
• Amazon Product (Amazon)

Resources