Samsung Dishwasher 4C Error Code: Meaning, Causes & Fix
Water supply error — the dishwasher is not filling (or filling too slowly).
4C on a Samsung dishwasher is the same supply fault the washer line uses: the control opened the inlet valve, watched the level/flow, and did not see the machine fill in time. Supply problems (tap, hose, pressure) and the valve's inlet screen are the usual causes; the valve itself and the flow/level sensing follow. 4C rewards being read as a sentence about timing. The dishwasher does not measure whether water exists at the tap; it opens its valve and judges the fill it actually gets against the time it should take. Everything Samsung lists for the code is a way for that judged fill to fall short: a valve closed or frozen or worn, a filter furred with foreign substances, a hose that bends, folds or — in the FloodSafe case Samsung Canada singles out — restricts by design, a house whose pressure dips under load, and finally the control that does the judging. That is also why 4C is shared, almost word for word, with Samsung's washers: the judged-fill logic and its causes are a Samsung platform idea, not a dishwasher idea. The practical moral is that 4C is rarely a broken dishwasher; it is a supply being measured and found wanting, and the machine is the most accurate pressure gauge in the house precisely because it complains in writing.
What causes the 4C code on a Samsung dishwasher?
Supply tap off or partly open
Especially after under-sink work.
Kinked or crushed inlet hose
Common after the machine was pushed back into its bay.
Clogged inlet screen at the valve
Sediment throttles flow below the fill threshold.
Failed inlet valve or low house pressure
Valve solenoid failure, or pressure too low for the timed fill.
A FloodSafe hose quietly throttling the fill — the cause Samsung names by brand type
Samsung Canada's 4C guidance contains an instruction found nowhere else in its dishwasher materials: avoid FloodSafe hoses. These leak-protection supply hoses contain a valve that shuts or restricts flow when it senses a surge — and a dishwasher's inlet valve opening can look enough like a surge to trip one, or the hose's internal restriction simply starves the fill. The result is a dishwasher that filled happily on its old hose and codes 4C from the day a 'safer' hose was fitted, with the tap wide open and the valve screen spotless. If 4C's birthday matches a hose change, a plumbing repair, or a new installation using a protection hose, that hose is the diagnosis until a standard hose proves otherwise.
A frozen supply line or valve in cold weather
Samsung's Gulf-region dishwasher guide lists frozen water supply among 4C's causes — a closed valve, a defective valve, a filter clogged by foreign substances, and a supply valve frozen or covered in ice. That reads oddly until you picture the installations it covers worldwide: dishwashers in unheated utility rooms, garages and holiday homes, where a cold snap freezes the small volume of water standing in the valve and the first part of the line. The pattern is unmistakable once seen — 4C on the first cycle after a freezing night, in a machine that ran perfectly before, sometimes clearing by afternoon. Samsung's remedy for the frozen branch is gentle thawing (it suggests melting ice with a warm towel), never force and never a heat gun near plastic fittings.
Water pressure or temperature outside the window the fill expects
Samsung Canada defines 4C/4E as inadequate water pressure or temperature, and directs owners to check the water supply requirements — a reminder that the fill is judged, not just attempted. Pressure that sags when the house is busy (showers, irrigation, a washing machine filling at the same moment) can stretch a fill past its limit at predictable times of day, which is why a 4C that keeps office hours is a house-pressure story rather than a machine story. Temperature matters at the other extreme: several Samsung dishwasher families also supervise an excessively hot supply under a separate code, so a supply rearranged during plumbing work — dishwasher newly fed from the wrong line — can produce supply codes that no amount of hose-straightening will cure.
Checks to run before you replace anything
- Confirm the under-sink tap is fully open and test flow at the tap if a hose can be diverted to a bucket.
- Check the inlet hose run for kinks at the back of the machine.
- Inspect and rinse the valve's inlet screen (water off first).
- Prove the supply at the dishwasher's own connection, not at a convenient tap elsewhere: the under-sink valve feeding the dishwasher must be fully open (Samsung's first listed cause is a closed supply valve), and if you can divert the line into a bucket, the flow you see should be a strong, unhesitating stream. A tap elsewhere in the house running well proves the street supply, not this branch of it.
- Read the inlet filter the way Samsung phrases it — 'clogged by foreign substances' — with the water off: the small screen where the supply meets the dishwasher's valve collects grit, scale and the debris that plumbing work shakes loose. A screen that looks grey or sandy is a 4C with the evidence still in it, and its condition also testifies about timing: a screen clogged within weeks of building work is the building work.
- Walk the hose run with the machine's history in mind: newly pushed back into its bay (kink at the rear), newly installed (protection hose, partly closed valve, shipping debris), recently frozen (cold room, cold snap), or recently plumbed (sediment load). 4C is one of the codes where the calendar is a diagnostic tool, because the fill system itself changes so little — what changes around it is what breaks it.
- If everything external is proven and the machine still will not fill, listen at the valve during the fill attempt: a click and a hum with no water movement means the valve is being driven and is mechanically stuck or its screen is blocked internally; silence means the valve is not being driven at all, which moves the case to the control side Samsung lists — the control board — and into service territory.
How do i fix my samsung dishwasher error code 4c?
- Restore full supply: tap open, hose unkinked, screen cleaned.
- Meter the valve solenoid; replace the inlet valve if open-circuit or mechanically stuck.
- If supply is proven and the valve works, the flow meter/level sensing needs technician diagnosis.
- Restore the supply in Samsung's order: open the supply valve fully, clean the filter on the water supply valve, thaw a frozen valve or line gently with a warm towel if cold is the story, and straighten any bent or folded hose you find on the run. Each of those is a documented Samsung remedy for this code, and most 4C cases end inside that list.
- Replace a FloodSafe-type hose with a standard supply hose if one is fitted: Samsung's Canadian guidance says to avoid them for this exact fault, and no cleaning of screens or valves compensates for a hose that is designed to restrict the flow the dishwasher is timing.
- Replace the inlet valve when it is proven driven but stuck, or electrically open — and clean its new screen's surroundings as you fit it, because the sediment that clogged the first valve is still in the line and will introduce itself to the second. A valve that fails again within months is a water-quality report, not a parts-quality one.
- Stop at the control board, as Samsung does: its 4C causes end at control board failure with the instruction to contact the service centre. A dishwasher with a proven supply, a proven hose, a clean screen and a valve that is never driven has nothing left on the owner's list, and saying so is the correct end of the fix section, not a gap in it.
The part that usually fails: Water inlet valve
Usual failed part once screens and taps are proven; test the solenoid for continuity.
Samsung dishwasher error code 4c reset
Power-cycle after restoring supply; 4C clears when a timed fill completes normally.
Samsung dishwashers clear most codes when you cancel the cycle (hold Start/Cancel for about 3 seconds so the machine drains), then cut power at the breaker for 5 minutes. Restore power and run a short cycle. Leak-related codes (LC) will return immediately if water is still sitting in the base pan — the reset cannot clear water that is physically still there.
Why does the 4C code keep coming back?
Returning 4C at busy household times points to pressure sag; returning always points back to the valve or its screen re-clogging (house sediment). A 4C that returns after the obvious fixes sorts its remaining causes by timing. Returning within days of an inlet-filter clean means the line is feeding the filter a continuing diet of sediment — building work, a deteriorating supply pipe, a water heater shedding scale — and the durable fix is at that source. Returning only at busy household times is pressure sag, proven by running the dishwasher alone at a quiet hour. Returning from the very next cycle after a valve replacement, with supply proven strong, closes the owner's list: Samsung's final 4C cause is the control board, and that is a service diagnosis.
How to stop 4C coming back
- Supply tap off or partly open: Especially after under-sink work.
- Kinked or crushed inlet hose: Common after the machine was pushed back into its bay.
- Clogged inlet screen at the valve: Sediment throttles flow below the fill threshold.
Retrieving stored fault codes on Samsung dishwashers
Samsung dishwashers have a service/test mode on many models (entered with a button combination such as holding Normal + Power or a Delicate/Heavy pairing, model-dependent) that runs each component — fill, wash motor, drain, heater, dispenser — and displays stored codes. The combination for your model is in the service manual; the user manual does not document it.
Other Samsung dishwasher error codes
| Code | Meaning | First fix |
|---|---|---|
| 1C | Low-water level check (fold 'C1' is this code transposed) | Check the filter is not clogged, use dishwasher detergent, load dishes evenly, and turn the dishwasher off and on again |
| 1E | Clogged filter error on WaterWall models; low water level error in DW80 manuals (fold 'E1' is this code transposed) | Clean the fine filter at the bottom of the dishwasher and remove excessive soils from the tub, then run a cycle with detergent |
| 3C | Wash motor (circulation pump) error — the main wash pump is not running correctly. | Clear debris from the sump/pump inlet area. |
| 3E | High temperature water supply error on Samsung support pages; communication error (3E1 to 3E5, grouped with AE and bE3) in DW80 WaterWall manuals | Verify the hot water supply is not set above 176°F (80°C); if the temperature is correct and the code returns, request Samsung service |
| 4E | Water supply error (older display of the 4C water supply check) | Check the water supply valve is open and the inlet valve and line are not frozen or clogged; if it continues, close the supply valve and contact a Samsung service center |
| 4E5 | Water supply error variant; the dishwasher attempts to fill, then stops early with a dry tub (also shown as 4C5) | Make sure the water supply exists with proper pressure, the tap is open, and the hose is not kinked |
| 5C | Drain error — the dishwasher did not drain in the allowed time. | Clean filter and air gap; clear hose/sink path. |
| 5E | Drain error (older display of the 5C drain check; 5E1 to 5E5 in DW80 manuals) | After closing the water supply valve, check whether the drain hose is clogged or folded and whether the drain hole inside the sump is clogged |
| 7C | Water-level / wash-system error on WaterWall models — the WaterWall reflector (vane) movement is not being confirmed. | Clear the obstruction and reseat the vane on its track. |
| 7E | WaterWall reflector error; the water reflector is not able to move correctly | Remove anything interfering with the reflector and any tape fixing it; if it happens without interference, close the water supply valve and contact an authorized Samsung service center |
| 9E | Low water level error; there is not enough water in the dishwasher | Empty the dishwasher, add detergent, and run a normal cycle; if the error still occurs, switch off power at the circuit breaker and request Samsung service |
| AC | PCB communication check; abnormal communication between the main PCB and the sub PCB | Power-cycle the dishwasher once and retry; if the problem continues, contact an authorised Samsung service centre |
| AE | Communication error listed with the 3E communication group in DW80 WaterWall manuals | Turn the dishwasher off and try to start it again; if the problem continues, contact an authorized Samsung service center |
| AP | Access Point mode; the dishwasher is in AP mode to assist with connecting to a mobile device | Complete the connection setup, or turn the dishwasher off and back on again if you are not trying to connect it |
See the full list on the Samsung Dishwasher error codes hub.
Codes 4C gets confused with
OC — Overflow error — the dishwasher has detected too much water entering / an overfill condition. OC means the water level rose beyond what the control expects.
SC — Drain check error — the dishwasher is not draining properly (display variant of the 5C drain fault family). SC on Samsung dishwashers is the drain fault in letter form: the pump ran but the water level did not fall as expected.
PC — Zone Wash / dividing-valve check — Samsung reports PC when the Zone Wash function is not operating correctly; in Samsung's other documentation the same code is the dividing (distribution) valve check, displayed when the dividing valve that controls water distribution is defective. (Corrected 2026-10-28 against Samsung US + Samsung AU/Gulf support and the DW80B-series and DW50R4040BB manuals: the earlier entry's PC1/PC2 display variants, position-switch narrative and DIY distributor-motor replacement procedure appear in no Samsung source and have been removed. Samsung's documented owner remedy is a functional check — turn the dishwasher off and on again — then service if PC continues.) Samsung documents this one code under two names for the same water-distribution system.
3C — Wash motor (circulation pump) error — the main wash pump is not running correctly. Samsung's owner-facing wording for 3C is deliberately plain: 'Pump operation error — the pump has failed' (Samsung US), or 'Pump operation check' (Samsung AU and the DW80B-series manual).
Frequently asked questions
Is dishwasher 4C the same problem as washer 4C?
Yes — same supply fault family: taps, hose, inlet screen, valve.
What Does Samsung Dishwasher Error Code 4C Mean?
Samsung defines 4C (rendered 4E on some models) as a water supply error: the dishwasher opened its inlet valve and did not fill as expected. Its published causes are the water supply valve — closed, frozen, or defective — the filter on that valve clogged by foreign substances, and control board failure; Samsung Canada adds the framing that the fault is inadequate water pressure or temperature, and directs owners to check the water supply requirements and ensure the supply is on. In practice the fault is usually outside the machine: a partly closed under-sink tap, a clogged inlet screen, a kinked or protection-type hose, or house pressure too low for the timed fill.
How to Fix Samsung Dishwasher Error Code 4C?
Work the supply chain in Samsung's order. Confirm the under-sink supply valve is fully open. Turn the water off and clean the filter on the water supply valve, which Samsung describes as clogging with foreign substances. Straighten any bent or folded hose, and if a FloodSafe-type protection hose is fitted, replace it with a standard hose — Samsung Canada explicitly advises avoiding FloodSafe hoses for this code. If the machine lives somewhere cold and the code followed a freeze, thaw the valve and line gently with a warm towel. A defective valve is replaced; a machine with proven supply that still will not fill has reached Samsung's last listed cause, the control board, which is service work.
Samsung Dishwasher Error Code 4C Reset
4C needs no reset procedure and Samsung publishes none: the code clears when a fill completes normally after the supply is restored. The practical sequence is to fix the cause (valve open, inlet filter cleaned, hose straightened or replaced), restore power if you cut it, and start a normal cycle — the dishwasher re-tests the fill immediately, and a cycle that fills and washes has cleared 4C in the only sense that matters. If you want a clean start after electrical work, a brief power-cycle at the breaker is harmless, but a power-cycle performed instead of the supply fix simply re-runs the same failed fill.
Does Samsung Bespoke Dishwasher Error Code 4C Mean the Same Thing?
Yes. Bespoke-panel dishwashers are Samsung's standard dishwasher platforms behind a design panel; the water system, the inlet valve and its filter, and the code table are the platform's, not the panel's. A Bespoke dishwasher showing 4C has the same water supply fault with the same Samsung causes — supply valve closed, frozen or defective, its filter clogged, low pressure — and the same fixes, starting with the under-sink valve and the inlet screen. The panel changes how the kitchen looks, not how the dishwasher fills.
What Does Samsung Dishwasher Error Code 4C Mean on a SmartThings Model?
The same water supply fault, reported in two places. Connected Samsung dishwashers mirror their display codes to SmartThings, so a 4C notification on your phone is the machine's 4C — the fill did not happen as expected — and it is diagnosed at the dishwasher, not in the app: supply valve, inlet filter, hose type and run, house pressure, in Samsung's order. The app adds convenience (you learn about the failed fill without opening the door) but no separate cause list; clearing the notification without fixing the supply just means the next cycle sends it again.
Why Does Samsung Dishwasher Error Code 4C Only Happen Sometimes?
Because the fill is timed against a threshold, and several 4C causes live exactly at that threshold. House pressure that sags when other outlets run makes the same machine pass at midnight and fail at shower time. A partly clogged inlet screen passes small fills and fails larger ones. A protection hose restricts more as flow demand rises. Intermittent 4C is therefore not an electronic ghost — it is a marginal supply being honest about its worst moments, and the fix is to find which margin you are on (time of day, hose type, screen condition) rather than to replace the valve and hope.
How do i fix my samsung dishwasher error code 4c?
Start here: Restore full supply: tap open, hose unkinked, screen cleaned. Meter the valve solenoid; replace the inlet valve if open-circuit or mechanically stuck.
What does error code 4c mean on samsung dishwasher?
Water supply error — the dishwasher is not filling (or filling too slowly). 4C on a Samsung dishwasher is the same supply fault the washer line uses: the control opened the inlet valve, watched the level/flow, and did not see the machine fill in time.
Related guides
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