4C is Samsung's cotton cycle with a water temperature of 40 degrees Celsius

The 4C marking on your Samsung washing machine refers to a specific preset cycle designed for cotton fabrics at 40°C (104°F) water temperature. The number tells you the temperature in Celsius, and the letter C stands for cotton. This is one of the most commonly used cycles because it handles everyday cotton items—T-shirts, jeans, towels, underwear—while using warm enough water to clean effectively without damaging the fabric or fading colours as quickly as hot water would.

Samsung includes this cycle because 40°C is the standard temperature recommended by most clothing manufacturers for regular cotton washing across Europe and many other regions. It balances cleaning power with fabric care and energy efficiency. If you see other cycles marked similarly—like 20C, 30C, or 60C—they follow the same naming pattern: the number is the temperature, and the letter indicates the fabric type.

Key Takeaways

  • 4C means a 40°C cotton cycle, suitable for everyday cotton clothing like jeans, T-shirts, and towels.
  • The temperature of 40°C is warm enough to remove dirt and stains but cool enough to prevent excessive fading and fabric wear.
  • This cycle typically runs longer than a quick wash because it allows time for detergent to work at a lower temperature.
  • You can adjust water level, spin speed, and other settings even after selecting 4C, depending on your machine's features.

When to use the 4C cycle

Use 4C for your regular weekly wash of mixed cotton items that are not heavily soiled. This includes everyday clothing, bed linens, kitchen towels, and cotton-blend fabrics. The cycle is designed to clean these items thoroughly while protecting colour and fibre integrity over time.

Avoid 4C for heavily stained or muddy items—those benefit from a hotter cycle or a pre-soak. Do not use it for delicate fabrics like silk or wool, which require their own gentler cycles. If your clothes are only lightly soiled or you want to save energy, the 20C or 30C cycle will work for cotton items and uses less water and electricity.

How long the 4C cycle takes

A standard 4C cycle on most Samsung machines runs between 45 minutes and 1 hour 15 minutes, depending on the load size and your specific model. Because the water is only 40°C rather than hot, the machine needs more time to allow detergent to dissolve and work effectively. Faster cycles skip this soaking time and use hotter water to compensate.

If your Samsung machine has an Eco or Eco Drum Clean option, selecting that alongside 4C will extend the cycle further but reduce water and energy use. Check your machine's display panel during the cycle—most Samsung washers show the remaining time, which updates as the cycle progresses.

Adjusting settings within the 4C cycle

After you select 4C, you can usually modify several settings without changing the core cycle. Most Samsung machines let you adjust the spin speed (to reduce drying time), water level (to match your load size), and sometimes the rinse count (extra rinses help remove detergent residue). Some models also offer a delay start, so the cycle begins at a time you choose.

Look for buttons or a touchscreen menu labeled "Options," "Settings," or "Spin Speed." If you reduce the spin speed, your clothes will be wetter when they come out and will take longer to dry. If you increase it, they will be drier but the cycle may be slightly noisier during the spin phase. You cannot change the water temperature once 4C is selected—if you need hotter or colder water, you must select a different cycle.

Comparing 4C to other common Samsung cycles

Samsung machines typically offer several cotton cycles at different temperatures. The 20C cycle uses cold water and is gentler on colours and energy bills but less effective on stains. The 30C cycle is slightly warmer and works well for lightly soiled items. The 60C cycle uses hot water and is better for heavily soiled whites, towels, and items that need sanitizing, but it uses more energy and can fade colours faster.

The Quick Wash or Speed Wash cycle (often marked 20 or 30 minutes) uses hotter water and shorter soaking time to clean lightly soiled items in under half an hour. If your machine has a Mixed Fabrics or Synthetics cycle, those are designed for blended materials and typically run at 40°C as well but with a gentler spin to protect elastic and delicate weaves.

What detergent to use with 4C

At 40°C, both liquid and powder detergents work well, though liquid detergent dissolves slightly faster in warm water. Use the amount recommended on your detergent bottle—more detergent does not clean better and leaves residue on clothes. If your water is hard (mineral-rich), you may need slightly more detergent or consider using a water softener additive.

Enzyme-based detergents, which break down protein stains like blood and grass, work best at temperatures between 30°C and 40°C. If you use a detergent pod or capsule, place it in the drum before adding clothes—do not put it in the detergent drawer, as the drawer may rinse it away before the cycle begins on some Samsung models.

Troubleshooting if 4C is not working as expected

If clothes are not coming out clean after a 4C wash, check that the detergent dispenser is not clogged and that you are using enough detergent for your load size. Hard water can reduce cleaning power, so if you live in a hard-water area, try a detergent designed for hard water or run a cleaning cycle on your machine monthly.

If the cycle is taking much longer than usual, the machine may be detecting a heavy load and extending the wash time automatically. If the cycle stops partway through, check that the door is fully closed and that the water supply is turned on at the tap. If problems continue, consult your machine's manual or contact Samsung support—do not attempt to repair internal components yourself.

Frequently Asked Questions

Is 4C the same as 40 degrees on other washing machines?

Yes. The 4C marking is Samsung's shorthand for a 40°C cotton cycle. Other brands may label it differently—some say "40°C Cotton" or "Normal Wash"—but the cycle is essentially the same: warm water, standard agitation, and a duration suited to cotton fabrics at that temperature.

Can I wash colours in the 4C cycle?

Yes, 4C is safe for coloured cotton items. The 40°C temperature is cool enough to prevent excessive fading. If colours are very bright or new, the 30C cycle is slightly gentler, but 4C is the standard choice for everyday coloured clothing.

Will 4C remove tough stains?

4C can remove many common stains, but heavily set or dried stains may need pre-treatment or a hotter cycle. For stubborn stains, explore a stain remover directly to the fabric, let it sit for 10–15 minutes, then run the 4C cycle. For very dirty items, the 60C cycle is more effective.

Does 4C use more water than a quick wash?

Yes, 4C typically uses more water than a quick wash cycle because it allows time for detergent to work at a lower temperature. If water usage is a concern, select the 20C or 30C cycle, or use your machine's Eco mode, which reduces both water and energy consumption.

What if my Samsung machine does not have a 4C button?

Older Samsung models or those sold in certain regions may label cycles differently. Look for a button marked "Cotton," "Normal," or "40°C." If you cannot find it, check your machine's manual—it will show the cycle names and temperatures for your specific model.