What should I check first for Samsung washer error OC?

If the washer is overfilled, unplug it and watch whether it keeps filling — if it does, the inlet valves are not closing.

What usually causes Samsung washer error OC?

The inlet water valves are not shutting off the water flow

OCHigh

Samsung washer error OC

Overflow condition

Also shows as OE

Symptom
OC
Free checks
2 checks
Then the part
The inlet water valves are not shutting off the water flow

The 2 free checks

Start at the top. Unplug the machine first.

01
If the washer is overfilled, unplug it and watch whether it keeps filling — if it does, the inlet valves are not closing.
02
If the washer is not actually overfilled, the fault is the water level sensor rather than the valves.

What causes it

Listed most likely first.

Cause	How often	DIY
The inlet water valves are not shutting off the water flow	Most common	Call a pro
The water level sensor is not reading the level accurately	Common	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.