Samsung · Washer · Error code
4C – Water supply problem detected
4C (sometimes shown as 4E) means the washing machine is not filling with water correctly within the expected time.
Smart summary for 4C
This quick AI-style overview sums up how serious this error is, how hard it usually is to fix yourself and roughly how long it takes.
What 4C means
Error 4C on Samsung washing machines indicates that the appliance has detected a water supply problem. The control board expects the drum to fill within a certain time. If water flow is too slow or stops, the 4C warning appears.
Common causes
- Taps for the hot/cold supply not fully open or recently turned off
- Blocked inlet filter screens where the hoses connect to the machine
- Kinked, crushed or frozen inlet hose
- Low mains water pressure or temporary supply interruption
Quick checks you can do yourself
- Switch off the machine and turn off the water taps.
- Unscrew the inlet hoses from the back of the washer and carefully remove the small filter screens in the valve inlets.
- Rinse the filter screens under running water to remove grit or limescale, then refit them securely.
- Check the hoses for kinks or crushing and make sure the taps are fully open.
- Run a quick wash or rinse cycle and watch the fill stage to confirm a strong, steady flow of water.
Always unplug the appliance and switch off power at the mains before removing panels or working near wiring or water connections.
When to call a professional
If the 4C error persists even with good water pressure and clean filters, the inlet valve assembly or internal pressure sensing may be faulty. At that point it is safer to have a technician test the valves and control board rather than continuing to retry fills.
Recommended next steps
If cleaning the filters restores normal filling, keep them in mind as routine maintenance every few months. If your home has very low pressure or shared supply, try avoiding using multiple water-hungry appliances at the same time.
Typical repair cost
£0–£120. Many 4C issues are down to tap, hose or filter problems you can fix yourself. A replacement inlet valve usually falls in the £40–£120 fitted range.
How to prevent this error in future
- Leave the washer’s inlet filters and hose screens cleaned every few months, especially in hard‑water areas.
- Avoid trapping or sharply bending the inlet hose behind the machine.
- Keep the water supply tap fully open and avoid running other water‑hungry appliances at the same time.
Recommended parts & cleaners
The link below searches for compatible parts, hoses and cleaners that may help resolve 4C issues on your Samsung washer. Always check compatibility with your exact model before ordering.
View related parts on Amazon Open Amazon search →FAQs for 4C
What does 4C mean on a Samsung washer?
Error 4C on Samsung washing machines indicates that the appliance has detected a water supply problem. The control board expects the drum to fill within a certain time. If water flow is too slow or stops, the 4C warning appears.
Can I keep using the washer with error 4C?
Usually you can do basic checks safely, but if you notice leaks, burning smells, unusual noises, or tripped electrics, stop and investigate before continuing.
How do I reset a Samsung washer after this error?
A safe first reset is to power the appliance off at the socket (or isolator) for 60 seconds, then turn it back on. If the error returns immediately, focus on the causes listed above rather than repeated resets.
What is the most common fix for 4C?
Most commonly: Taps for the hot/cold supply not fully open or recently turned off. Start with the first DIY checks and work down the list.
About this guide
This guide was created by the CodeSolveAI Appliance Help Team. We use manufacturer information, typical engineer reports and safe DIY practice to keep these pages up to date and practical.
Last reviewed: March 2026.
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