Samsung 4E / 4C: Water Supply Error
Medium severity
If a Samsung dishwasher stalls during fill and the display shows 4E or 4C, the unit isn't seeing the water pressure or temperature it expects at the inlet, and it won't move on until that's resolved.
Applies to: Most Samsung DW-series dishwashers with digital displays
What it means
Both characters point to the same fault — Samsung's water-supply error — just rendered differently across model years. The dishwasher isn't getting water at the pressure or temperature it needs during the fill portion of the cycle, so the control board holds the cycle rather than run a wash with too little water.
Common causes
- Water supply valve under the sink not fully open
- Kinked or blocked water inlet hose
- Household water pressure below the appliance's minimum requirement
- A clogged inlet filter screen where the hose connects to the valve
- Using a FloodSafe-style hose that has triggered its own shutoff (not compatible with some Samsung fill systems)
What you can check yourself
- Confirm the water shutoff valve under the sink is fully open
- Check the fill hose for kinks between the valve and the dishwasher
- Run the kitchen faucet briefly to confirm normal water pressure and no air in the line
- If your installation uses a third-party flood-safe supply hose, check Samsung's compatibility guidance, since some designs conflict with the fill sensor
- Power-cycle the unit and try a normal cycle again
Call a professional when
If water pressure and the supply line both check out fine and 4E/4C persists, the water inlet valve itself is likely the failure point and needs professional replacement.
Related
- Samsung dishwasher codes — full list of Samsung fault codes
- Samsung 9E — low water level, a closely related fill problem
- Samsung LE — leak error
- Dishwasher Not Filling With Water — symptom guide across brands