Samsung Dishwasher Error 4C – Water Supply Error – Not Enough Water
The Samsung didn't get enough water in time. Start with the valve under the sink and the supply line.
At a glance
Severity: Low
- Meaning
- Water Supply Error – Not Enough Water
- System
- Samsung · Dishwasher
- Typical repair cost
- $0–$350
- DIY difficulty
- Easy
At the start of a cycle a Samsung dishwasher drains briefly and then opens its inlet valve. If the level sensor doesn't see the expected amount of water within the allowed time, it stops and shows 4C, or 4E on some displays. Samsung specifies a supply pressure of 20 to 120 psi and hot water between 120 and 149°F, and anything that pinches the flow below that, from a half-closed valve to a clogged inlet screen, can set the code. On new installs the shutoff valve and a kinked supply line are by far the most common reasons.
How it looks on the display
Model families & display variants
| Model family | Shows | Note |
|---|---|---|
| Top-control models | 4C | Hidden display on the door edge; open the door to read it. |
| Front-control models | 4E | Some displays show 4E. Samsung treats 4C and 4E as the same water supply code. |
| Models without a numeric display | blinking lights | Faults are shown with a blinking indicator pattern; the model's manual lists which pattern means water supply. |
Safety first · Consult a professional
Turn off the breaker and close the supply valve before loosening any fitting. The supply line is under full house pressure, so have a towel and a shallow pan ready.
- Unplug the appliance or switch off the breaker before opening any panel. Mains voltage can kill.
- Water and electricity: unplug first, keep towels ready and never stand in water while the appliance is connected.
Symptoms
- 4C or 4E on the display soon after starting
- Brief drain sound, then silence instead of the hiss of water entering
- Tub floor still dry or only damp when you open the door
- Code appears after plumbing work or a water outage
- Weak flow from the kitchen hot tap as well
Possible causes
Ranked by how often each cause is behind this code (editorial estimate).
- Shutoff valve under the sink closed or only partly open
- Supply line kinked or crushed behind or under the unit
- Inlet valve screen clogged with sediment, often after plumbing work
- House water pressure below about 20 psi
- Inlet valve coil or wiring failed
- Frozen supply line in an unheated space
Fix it step by step
Confirm the valve and faucet
Open the dishwasher shutoff fully and check that the kitchen hot tap delivers a strong, steady stream. If the whole house has low pressure, a plumber has to fix that first.
Tools: Flashlight
Inspect the supply line route
Remove the toe kick and look along the line to the inlet valve at the front left or right corner. It must not be pinched by a leveling foot or folded where it turns.
Tools: Screwdriver, Flashlight
Flow-test the line
With the breaker off and the valve closed, disconnect the line at the dishwasher inlet, hold it in a bucket and open the valve briefly. You should get a strong, steady stream; a trickle points to the valve or line.
Tools: Towels & shallow pan, Pliers
Clean the inlet screen
Look into the inlet valve fitting: a small mesh screen sits inside. Pick out sand or scale with needle-nose pliers without puncturing the mesh, then reconnect the line hand-tight plus a quarter turn.
Tools: Pliers, Flashlight
Check the drain hose height
The drain hose must loop up high under the counter or run to an air gap. If it lies low on the cabinet floor, fresh water can siphon out as fast as it comes in.
Tools: Flashlight
Test the inlet valve coil
If flow is good and the screen is clean, measure the valve coil with the connector off. An open reading means the valve must be replaced; this job is fine for a handy owner but many prefer a technician.
Tools: Multimeter, Screwdriver
How to reset 4C
- Press and hold Start (or Start/Reset) for about 3 seconds to cancel.
- Turn off the breaker or unplug for about a minute.
- Restore power, start Rinse and check that water enters within the first minute.
Where the parts are
- 1Door lock
- 2Water inlet valve
- 3Filter
- 4Circulation pump
- 5Heating element
- 6Drain pump
- 7Float switch
- 8Temperature sensor
- 9Water level sensor
Repair options & costs
| Repair | DIY? | Estimated cost |
|---|---|---|
| Open valve, straighten supply line | Yes | $0 |
| New stainless braided supply line with elbow | Yes | $15–$35 |
| Clean inlet screen | Yes | $0 |
| Inlet valve replacement by a technician | No | $150–$280 |
| Plumber to fix low house pressure or a bad shutoff | No | $150–$350 |
Rough US estimates; technician call-out fees vary by region. Not a quote.
When to call a technician
Call a technician when the supply line delivers a strong flow, the inlet screen is clean and 4C still returns; the inlet valve or the level sensor then needs electrical testing. A shutoff valve that won't open fully or house pressure below 20 psi is a plumber's job.
Frequently asked questions
Is 4C the same as 4E on a Samsung dishwasher?
Yes. Samsung lists both as the water supply code; which one you see depends on the display. The checks are identical.
My Samsung dishwasher is brand new and shows 4C. Why?
Most often the shutoff valve was never fully opened or the supply line got kinked when the unit was pushed into place. Check both before calling for warranty service.
Should a Samsung dishwasher be connected to hot or cold water?
In the US, Samsung wants a hot supply between 120 and 149°F. Hotter than that is a scald risk, and a cold connection makes cycles longer, though it doesn't cause 4C.
Can low water pressure alone cause 4C?
Yes. Below about 20 psi the tub doesn't fill in time, and the inlet valve may not close reliably either. If every faucet in the house is weak, fix the pressure first.
Sources
- Official Samsung user documentation and support pages (facts only; wording is our own)
- Methodology: How We Build Code Pages · Data Sources We Use · Editorial Policy