What should I check first for Samsung washer error 4C?

Check both water supply faucets behind the washer are fully open.

What usually causes Samsung washer error 4C?

A water supply faucet behind the washer is not fully open

4CLow

Samsung washer error 4C

Water supply — not filling or filling too slowly

Also shows as 4E, 1 4C, nF

Symptom
4C
Free checks
2 checks
Then the part
A water supply faucet behind the washer is not fully open

The 2 free checks

Start at the top. Unplug the machine first.

01
Check both water supply faucets behind the washer are fully open.
02
Check the fill lines for kinks and, in cold weather, for freezing.

What causes it

Listed most likely first.

Cause	How often	DIY
A water supply faucet behind the washer is not fully open	Most common	Yes
A fill line is kinked or frozen	Common	Yes
A water inlet valve is defective	Occasional	Call a pro

Before you check anything

Disconnect the power first. Unplug the machine at the socket, or switch off its circuit at the consumer unit if it is hard-wired. Do this before opening any panel, reaching into a pump filter, or moving the appliance.
Turn off the water before disconnecting a hose, and have a towel and a shallow tray ready — a drain hose holds water even when the drum looks empty.
Gas, mains wiring and sealed refrigeration are for a qualified professional — in many countries that is a legal requirement, not advice. If you smell gas, do not touch any switch: leave, and call your gas emergency number from outside.
Stop if you smell burning, see scorched wiring, or find water near an electrical connection. None of those is a code to look up.

The checks on this page are the manufacturer’s own, rewritten and sourced, and they are reference information rather than a repair instruction for your particular machine. Model, age and installation all change what is safe to do. You are the one standing in front of it — if a step looks wrong for the machine you have, trust that and call a technician.