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Samsung Dishwasher Error Code 4C

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 11, 2026
⚠ Medium Severity 🔧 Easy DIY Also shown as: 4E

Water supply error — dishwasher not filling

The most common cause of the 4C error on a Samsung dishwasher is supply valve under the sink closed or partially open (~40% of cases); start with: open the supply valve fully.

💰 DIY cost: $0–$60 👨‍🔧 Pro cost: $130–$260 Save $130+ by doing it yourself
Samsung Dishwasher error code 4C on the display panel
How the 4C code appears on a Samsung dishwasher display

What Does Error Code 4C Mean on a Samsung Dishwasher?

Water supply error — dishwasher not filling.

The control board opens the water inlet valve at the start of a fill step, then watches its flow sensor and float for water arriving within a set time window. If insufficient flow is registered, it halts and posts 4C (4E on older panels). This is a fill-side fault, distinct from 5C/5E drainage errors or LC/leak detection — the machine sees too little water coming in, not water failing to leave or pooling in the base.

Models affected: Samsung dishwashers displaying 4C or the older 4E code, including models such as DW80R5060US, DW80K5050US, DW80B6060US, and DW80CG4051SR
What owners report: Owners commonly report 4C appearing right after installation, after the supply was shut off for plumbing work, or following a period of low household water pressure. A frequent quick win is simply reopening a partially closed shutoff valve or straightening a kinked fill line, and many find clearing scale from the inlet screen resolves it without any parts.

What Causes Error Code 4C?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

  1. 1
    Supply valve under the sink closed or partially open 40% of cases
  2. 2
    Clogged inlet screen at the valve 25% of cases
  3. 3
    Kinked supply line 20% of cases
  4. 4
    Failed water inlet valve 15% of cases

How to Fix Samsung Dishwasher Error Code 4C

🔧 Easy DIY Est. time: 10–20 min
⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.
  1. 1

    Open the supply valve fully

    Check the shutoff under the sink — it should be fully counterclockwise. Half-open valves drop pressure below the fill threshold.

  2. 2

    Check water pressure

    The dishwasher needs roughly 20 psi minimum. If the kitchen faucet runs weak too, the problem is upstream.

  3. 3

    Clean the inlet screen

    Shut the supply, disconnect the fill line at the dishwasher's inlet valve, and clean the small mesh screen of scale and grit.

    ⚠️ Put a towel down — the line holds water.
  4. 4

    Replace the inlet valve

    If supply and screen are good but no water enters, swap the inlet valve (front lower panel, two wires and two connections).

    🔩 Samsung dishwasher inlet valve ($25–$60)
    ⚠️ Switch off the breaker before opening the panel.

How to Reset Error Code 4C

Restore the water supply, then switch the breaker off for 60 seconds and run a short cycle to confirm filling.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

Full Samsung dishwasher reset guide → Enter diagnostic mode →

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When to Call a Professional

If water pressure and the valve check out but 4C persists, the flow sensor or control board needs professional testing.

Average professional repair cost for this issue: $130–$260

Related Error Codes

LC
Leak sensor activated — water detected at base of dishwasher
⚠ High Severity
5C
Drain failure — water not draining from dishwasher
⚠ High Severity
HC
High temperature heater error — water overheating detected
⚠ High Severity

Find Replacement Parts

Use these links to find the exact replacement parts for your Samsung Dishwasher:

🔩
Search PartSelect
Samsung Dishwasher repair parts
🔧
Search RepairClinic
Step-by-step video guides

External links — ApplianceErrors.com is not affiliated with these retailers.

More Samsung Dishwasher Error Codes

3C Wash motor error — circulation pump failure HE Heater error — water not heating tE Temperature sensor failure — NTC thermistor fault 7E Water wall reflector error — water wall sensor blocked 1E Water inlet sensor failure bE2 Button error — control panel button shorted

Frequently Asked Questions

Can I keep using my Samsung Dishwasher when error 4C appears? +
You often can for a cycle or two, but the water-supply issue behind 4C will keep interrupting normal operation until it is fixed. Plan the repair rather than ignoring the code.
What most commonly causes 4C on a Samsung Dishwasher? +
Across reported Samsung dishwasher repairs, the most frequent is supply valve under the sink closed or partially open (40% of cases), clogged inlet screen at the valve (25%), then kinked supply line (20%). Check them in that order before replacing any parts.
4C keeps coming back after a reset — what should I check next? +
A reset only clears the stored 4C fault; if it returns, the water-supply problem is still present. Move on to the physical checks — open the supply valve fully, then check water pressure — since the code will reappear until the root cause is resolved. This is a beginner-friendly job needing only basic hand tools.
How much does it cost to fix Samsung Dishwasher error 4C? +
A DIY repair typically runs $0–$60 in parts, versus $130–$260 for a professional service call, so handling it yourself saves around $130. Expect the work to take about 10–20 minutes.
Which Samsung Dishwasher models show error 4C? +
4C is documented on Samsung dishwashers displaying 4C or the older 4E code, including models such as DW80R5060US, DW80K5050US, DW80B6060US, and DW80CG4051SR. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

Content verified against manufacturer service documentation. Last verified: June 11, 2026.

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