FixByModel
OC

Samsung OC: Overfill; too much water in the tub

The dishwasher senses more water than a normal cycle should hold. It can be caused by a stuck level sensor, a valve that won't shut off, a drainage restriction, or excess suds.

May need a technician

By the FixByModel editorial team · Verified 2026-09 · Researched against manufacturer support & repair references (below)

Most likely causes

  1. Faulty or stuck water-level (case break) sensor
  2. Water inlet valve stuck open
  3. Blocked or improperly connected drain hose
  4. Excess detergent or wrong type creating foam
  5. Drain/sump restriction
Where water collects
1Door gasket
2Hoses & sump
3Base tray
4Float switch

Schematic illustration of a typical dishwasher — not your exact model.

Before you start — unplug the appliance and turn off the water supply. You'll be working near water and electrical parts, and drained water can be hot. If a step involves the pump, wiring, or opening the cabinet and you're unsure, stop and call a qualified technician.

Step-by-step fix

1Turn off the waterShut off the dishwasher's water supply to stop further filling and prevent flooding.
2Drain and cleanCancel the cycle, let it drain, and clean the filter, sump, and drain hose.
3Check detergentUse the correct dishwasher detergent in the right amount to avoid excess suds.
4Retest cautiouslyRestore water and run a short cycle while watching the unit.
5Call a technicianIf OC returns, the inlet valve or level sensor likely needs professional testing or replacement.

Still showing OC?

If you’ve worked through every step and OC keeps returning, an internal part likely needs testing and replacement. That’s a job for a qualified appliance technician, who can measure the suspect part against the service-manual spec before replacing it.

Which models this applies to

Samsung dishwashers. Most Samsung dishwashers; also shown as 0C or OE on some models for the same overfill fault.

FAQ

What does Samsung OC mean?

Overfill; too much water in the tub. The dishwasher senses more water than a normal cycle should hold. It can be caused by a stuck level sensor, a valve that won't shut off, a drainage restriction, or excess suds.

What causes Samsung OC?

The most likely cause is faulty or stuck water-level (case break) sensor. Other causes include Water inlet valve stuck open; Blocked or improperly connected drain hose; Excess detergent or wrong type creating foam; Drain/sump restriction.

Can I fix Samsung OC myself?

Some checks are DIY, but this code often points to an internal component, so it may need a qualified technician.