FixByModel
4C

Samsung 4C: Water supply fault; not filling correctly

The dishwasher isn't getting enough water within the expected time. It usually points to a closed supply valve, a kinked or clogged inlet hose, low water pressure, or a failing inlet valve.

DIY fix

By the FixByModel editorial team · Verified 2026-09 · Researched against manufacturer support & repair references (below)

Most likely causes

  1. Water supply valve turned off or partly closed
  2. Kinked, blocked, or frozen inlet hose
  3. Clogged inlet-valve filter screen or mineral scale
  4. Low household water pressure
  5. Faulty water inlet valve
The fill path — check in this order
1Supply valve
2Fill hose
3Inlet valve
4Flow meter
5Tub

Schematic illustration of a typical dishwasher — not your exact model.

Before you start — unplug the appliance and turn off the water supply. You'll be working near water and electrical parts, and drained water can be hot. If a step involves the pump, wiring, or opening the cabinet and you're unsure, stop and call a qualified technician.

Step-by-step fix

1Open the supply valveConfirm the under-sink water supply valve for the dishwasher is fully open.
2Check the inlet hoseTrace the fill hose and straighten any kinks; if frozen, thaw it and the valve with warm towels.
3Clean the inlet filterShut off water, disconnect the hose, and clear debris from the small mesh filter inside the inlet valve.
4Verify water pressureRun the hose into a bucket to check flow; weak flow suggests a supply/pressure problem.
5Reset and retestHold Start/Cancel about 3 seconds to reset, then run a cycle. If it returns, have the inlet valve tested/replaced.

Still showing 4C?

If you’ve worked through every step and 4C keeps returning, an internal part likely needs testing and replacement. That’s a job for a qualified appliance technician, who can measure the suspect part against the service-manual spec before replacing it.

Which models this applies to

Samsung dishwashers. Most Samsung dishwashers; older models show 4E for the same water-supply fault (4E = 4C).

FAQ

What does Samsung 4C mean?

Water supply fault; not filling correctly. The dishwasher isn't getting enough water within the expected time. It usually points to a closed supply valve, a kinked or clogged inlet hose, low water pressure, or a failing inlet valve.

What causes Samsung 4C?

The most likely cause is water supply valve turned off or partly closed. Other causes include Kinked, blocked, or frozen inlet hose; Clogged inlet-valve filter screen or mineral scale; Low household water pressure; Faulty water inlet valve.

Can I fix Samsung 4C myself?

Usually yes. Start by working through the steps above, beginning with: confirm the under-sink water supply valve for the dishwasher is fully open.