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Severity: Moderate

Samsung Washing Machine Error OC – Overflow – Water Level Too High

The washer measured more water than it should hold. First check whether water still flows in when it's off.

Safety first · Consult a professional

If water keeps entering the drum with the washer off, or water reaches the floor, close both supply valves right away and unplug the washer – keep hands and cords away from standing water.

  • Unplug the appliance or switch off the breaker before opening any panel. Mains voltage can kill.
  • Water and electricity: unplug first, keep towels ready and never stand in water while the appliance is connected.

At a glance

Severity: 3/5 – Moderate3/5

Severity: Moderate

Meaning
Overflow – Water Level Too High
Typical repair cost
$0–$450
DIY difficulty
Easy

OC (often read as 0C, and shown as OE or OF on older models) means the water-level sensor reported a level above the safe maximum. Samsung washers react by stopping the cycle and running the drain pump to bring the level down, so you may hear pumping even with the error showing. The classic cause is an inlet valve that doesn't close fully – debris holds the valve open and water keeps trickling in, sometimes even with the washer switched off. Heavy suds, dirty water backing up from the house drain, or a sensor reading high can also set it.

How it looks on the display

Samsung Washing Machine display showing error OC

Model families & display variants

Model familyShowsNote
Current front-load and top-load modelsOCLetter O; many owners read it as the number 0C. Shown in SmartThings on connected models.
Older Samsung washersOE / OFEarlier labels for the same overflow condition.
Top-loadersOCSame meaning; the higher water level makes overflow into the cabinet more likely, so shut the valves first.

Symptoms

  • OC appears and the drain pump runs on its own
  • Water trickles into the drum even when the washer is off
  • Water level visibly above the bottom of the door glass
  • Water on the floor or dripping from the detergent drawer
  • Code shows with a lot of foam in the drum

Possible causes

Ranked by how often each cause is behind this code (editorial estimate).

  1. Water inlet valve sticking open because of grit or a worn diaphragm 34%
  2. Oversudsing from too much or non-HE detergent, pushing the level reading up 18%
  3. Water backing up from the standpipe or laundry sink into the washer 14%
  4. Water-level sensor or its air hose reading high (residue, trapped water) 14%
  5. Very high house water pressure making a weak valve weep 8%
  6. Control board keeping the valve powered 7%
  7. Drain pump unable to lower the level quickly (blocked filter) 5%

Fix it step by step

Diagnostic flow: OC1Stop any inflow2Get the water out3Do the power-off fill test4Rule out suds5Check for drain backflow6Have the sensor and valve tested

  1. Stop any inflow

    Turn off the hot and cold supply valves behind the washer, then unplug it. If the level keeps rising after the power is off but stops when the valves are closed, the inlet valve is leaking through.

    Tools: Flashlight

  2. Get the water out

    Plug back in with the valves closed and let the washer pump out on Drain/Spin. If it can't, drain a front-loader through the emergency tube behind the bottom-front cover, or bail a top-loader into a bucket.

    Tools: Towels & shallow pan

  3. Do the power-off fill test

    With the drum empty, washer unplugged, open the supply valves again and watch the drum for ten minutes with a flashlight. Any trickle into an unplugged washer means the valve must be replaced – don't leave the valves open until it is.

    Tools: Flashlight

  4. Rule out suds

    If the drum was full of foam, run Rinse+Spin with no detergent until the foam is gone and switch to HE detergent at the marked dose. OC that only appears with heavy foam usually isn't a hardware fault.

  5. Check for drain backflow

    Watch the standpipe or laundry sink while a nearby sink or the kitchen drains. If dirty water rises into the washer tub, the house drain is partly blocked or the hose sits too deep in the standpipe; keep only a few inches of hose inside the pipe.

    Tools: Flashlight

  6. Have the sensor and valve tested

    If the fill test is dry and there's no foam or backflow, the sensor, its air hose or the control is misreading. A technician can compare the sensor frequency with the actual level and test the valve coils.

    Tools: Multimeter

How to reset OC

  1. Close the supply valves and unplug the washer for a minute.
  2. Plug in and run Drain/Spin to empty the tub.
  3. Open the valves and start Rinse+Spin, staying nearby.
  4. If OC returns or water rises past the door glass, close the valves and stop using the washer until it is repaired.

Where the parts are

Washing machine: drain filter, pump and door lock – OC12345678
Washing machine: drain filter, pump and door lock
  1. 1Door lock
  2. 2Water inlet valve
  3. 3Water level sensor
  4. 4Filter
  5. 5Drain pump
  6. 6Motor
  7. 7Heating element
  8. 8Temperature sensor

Repair options & costs

RepairDIY?Estimated cost
Extra rinse and correct HE detergent dose Yes $0
Reposition drain hose in the standpipe Yes $0
Water inlet valve (DIY part) Yes $35–$80
Inlet valve replaced by a technician No $150–$280
Water-level sensor or control board repair No $180–$450

Rough US estimates; technician call-out fees vary by region. Not a quote.

When to call a technician

Call a technician right away if water enters the drum with the washer unplugged and you can't fit a valve yourself – leave the supply valves closed until then. Also book service if OC returns without foam or drain backflow, since the sensor or control board is then the suspect.

Frequently asked questions

Why is my Samsung draining by itself with OC on the display?

That's the overflow protection working. When the sensor reports too much water, the washer runs the drain pump to lower the level and prevent water from escaping the tub.

Is it OC or 0C?

Samsung prints it with the letter O, but on a segment display it looks like zero. Both mean the same overflow warning, as do OE and OF on older models.

Can I just leave the water valves closed between loads?

Yes, and with a leaking inlet valve you should. Turning the valves off after each wash is a good habit anyway, because it takes pressure off hoses and the valve.

Can too much detergent really cause an overflow code?

Yes. Thick foam raises the pressure the level sensor sees, so the control thinks the tub is overfilled. Use HE detergent and measure it; pods plus liquid detergent in the same load is a common mistake.

Sources