Can I fix Samsung code 4C myself?

Start with these safe checks: Make sure the water supply valve under the sink is fully open and the supply line isn't kinked. Samsung advises against FloodSafe-type hoses. Turn the breaker off for 30 seconds, turn it back on and start a Normal cycle. If it still won't fill, request service.

When should I call a technician for code 4C?

If it still won't fill, request service. Unplug it or switch the breaker off before you remove any panel. Don't test or replace wiring, control boards, heating elements or motors under power. If you see scorching, smell burning, or the breaker trips again, leave it off and call a qualified appliance technician or electrician.

Samsung Dishwasher Error Code 4C / 4E: Water supply error

What 4C means

The dishwasher isn't getting water at the pressure or temperature it needs.

Also shown as: 4E, depending on the model.

Likely causes

Water supply valve under the sink closed or partly closed
Kinked supply line
Low water pressure

Safe first checks

Make sure the water supply valve under the sink is fully open and the supply line isn't kinked. Samsung advises against FloodSafe-type hoses.
Turn the breaker off for 30 seconds, turn it back on and start a Normal cycle.

When to stop

If it still won't fill, request service.

Checked against: Samsung US: Samsung dishwasher is displaying an error code. Codes can differ by model and year, so confirm with your owner's manual.