What to check yourself
Step 1. Let it drain, then look at whether it managed
Cancel the cycle and give the machine a few minutes to empty itself. What happens next splits the diagnosis in two, and it costs nothing to watch. If it drains and the code goes, the machine was probably reading foam as water. If the tub stays full, this is a drain problem wearing an overfill label.
Step 2. Work out what went into the dispenser
Foam is the most common cause and the cheapest fix. A squirt of hand washing up liquid, or a pod plus extra powder, produces suds that the level sensor reads as water. Run a rinse only cycle with nothing in the dispenser, twice if there is visible foam, then go back to normal dishwasher detergent at half the dose you were using.
Step 3. Clean the filter and check the drain path
If the tub did not empty, treat this as a drain fault: filter out and rinsed, sump cleared, drain hose checked for kinks and for its high loop, air gap cleaned, disposal knockout plug confirmed out. It is the same list as the drain code, because it is the same plumbing.
Step 4. Check the machine is sitting level
Rarely mentioned and genuinely a cause. A machine tilted forward or sideways pools water at one end of the tub, and the sensor sees a level that is not really there. A spirit level across the bottom rack and a turn of the front feet is a five minute job.
Step 5. Watch for a fill that will not stop
The serious version of this code. If the machine keeps taking on water even with the cycle cancelled, shut the supply valve under the sink immediately. An inlet valve that has stuck open is the one fault here that can genuinely flood a kitchen, and it does not fix itself.
If water is still coming in with the machine off, turn the supply off at the valve and leave it off until it has been repaired.
What a technician will look at
Described so you know what you are paying for, not as steps to repeat.
Test the level sensor and the inlet valve
With foam and drainage ruled out, the two candidates are the sensor reading the level and the valve letting water in. Both are metered rather than guessed at.
When to call a technician
If water keeps entering with the machine switched off, call straight away and shut the supply valve in the meantime. Otherwise, when the drain path is clear, the detergent is right and the machine is level, and OC still returns.
What the repair costs
| Repair | Part only | Fitted by a technician |
|---|---|---|
| Rinse cycles and a change of detergent | - | Free |
| Levelling the machine | - | Free |
| Water level sensor replacement | $20 to $70 | $150 to $300 |
| Water inlet valve replacement | $25 to $80 | $95 to $300 |
| Drain pump replacement, if it turned out to be drainage | $20 to $100 | $150 to $400 |
A new machine of the same class runs $500 to $1,500. Once a quote passes about a third of that on an older appliance, the repair stops making sense.
Codes people confuse this with
Questions people ask
- My LG dishwasher shows OE for a drain fault. Is this the same thing?
- No, and this is the pairing worth being careful about. On an LG, OE means the water will not go out. On a Samsung, OC and oE mean there is too much water in there. Opposite ends of the same problem, and different parts.
- How does foam make it think there is too much water?
- The sensor measures a level, and it cannot tell foam from water. A tub half full of suds reads as a tub half full. That is also why the fix is a rinse cycle rather than a part.
- Is my kitchen at risk right now?
- Only if water is still coming in with the machine off. That means a stuck inlet valve, and you should close the supply valve under the sink now rather than after the next cycle. Everything else here waits until morning.
Which machines this applies to
Applies to
Samsung dishwashers across the DW80, DW50 and Linear Wash ranges. Read off the panel as OC, 0C or oE depending on the machine. On an LG dishwasher the same two letters mean the opposite: water that will not leave rather than too much of it.
Last checked
2026-08-10