The 4C error code on a washing machine indicates that the machine has detected a problem with the water supply. The most common reason for this error is a blocked or kinked water supply hose. The following are the steps to resolve the 4C error code:

1. Fully power off and unplug the washing machine at the mains.
2. Move the machine forward to give access to the water hoses.
3. Check that there are no kinks or bends in the water hose connected to the machine and make sure the hose is not damaged.
4. Check that the water tap connected to the washing machine is open to full.
5. Clean the water hose mesh filter at least twice a year to prevent build-up.
6. Turn off the water supply.
7. Disconnect the inlet hose from the water supply.
8. Check for any obstructions in the dispenser drawer and clean if required.

If the above steps do not resolve the issue, it is recommended to contact a professional repair service.