The 4C error code on a Samsung washing machine indicates that there is an issue with the water supply to the machine. This can be caused by several reasons, such as low water pressure, a low flow rate, closed water taps, faulty water hoses, or a blocked or kinked water supply hose. To resolve the issue, you can try the following troubleshooting steps:

1. Check that both the hot and cold water taps are turned on properly.
2. Inspect the water hoses for defects, such as kinks, bends, or blockages.
3. Clean the water hose mesh filter at least twice a year to prevent build-up.
4. Turn off the water supply and disconnect the inlet hose from the water supply.
5. Occasionally, a 4C check code error message may be displayed if there is a blockage in the dispenser drawer. Follow the steps to clean the detergent drawer.
6. Blow a lot of air to the pressure sensor hose and drain completely the water using filter.

If the issue persists, its best to call a repair technician.