Samsung dishwasher — Error Code OC
The OC error indicates an overfill condition detected by the water level sensor.
What it means
The OC (often displayed as 0C or oC) error code on a Samsung dishwasher is triggered when the main control board detects an abnormally high water level inside the tub. This fault is flagged by the water level sensor (often integrated into the case brake assembly or pressure switch) when the water volume exceeds the safe operational threshold. When this code trips, the dishwasher will typically halt the wash cycle and automatically activate the drain pump in an attempt to prevent flooding. The underlying fault usually falls into one of three categories: water continuously entering the tub due to a mechanical failure, water failing to exit the tub during the drain phase (leaving residual water that compounds on the next fill), or a false reading from a defective water level sensor or compromised wiring harness.
Likely Causes
- 1 Failed Water Inlet ValveThe internal diaphragm of the water inlet valve can tear or become stuck open by hard water deposits, allowing water to seep into the tub even when the dishwasher is powered off.
- 2 Defective Water Level Sensor / Case BrakeThe case brake assembly contains a sensor that monitors water flow and level. If the sensor fails or the internal pathways clog, it sends a false overfill signal to the main control board.
- 3 Drain System BlockageA clogged filter assembly, blocked drain hose, or failing drain pump can leave residual water in the tub. When the next cycle starts, the new water combined with the old water triggers the overfill sensor.
- 4 Main Control Board FaultA stuck relay on the main control board can send continuous 120V power to the water inlet valve, causing the dishwasher to fill without stopping.
How to clear / reset
To temporarily clear the OC error code, power cycle the dishwasher by turning it off and unplugging it (or flipping the circuit breaker) for 3 to 5 minutes to reset the main control board. However, if the tub is physically full of water, the code will immediately return once power is restored because the sensor will still detect the overfill state. You must manually bail out the excess water or force a drain cycle by holding the Start/Reset button. Ultimately, the OC code cannot be permanently cleared until the root mechanical or electrical failure is resolved.
Common replacement parts
When to call a pro
Call a professional if you have verified the drain system is clear but the OC code persists, as this usually points to a failed water inlet valve, a defective case sensor, or a main control board issue. Diagnosing these requires a multimeter to test for continuity and voltage under live conditions, as well as pulling the dishwasher out from under the counter. Axis Appliance Repair offers a $90 diagnostic (waived upon authorized repair) and backs all work with a 1-year parts and labor warranty. We can safely test the electrical components and replace the faulty parts without risking a kitchen flood.
FAQs
How much does it cost to fix a Samsung dishwasher OC error?
Repair costs typically range from $150 to $300, depending on whether the issue is a relatively inexpensive water inlet valve or a more costly case brake assembly or main control board.
Can I fix the OC error code myself?
Checking and cleaning the filter assembly or drain hose is a simple DIY task. However, replacing the water inlet valve or case brake requires uninstalling the dishwasher, disconnecting plumbing, and handling electrical components, which is best left to a professional.
Will the OC error code clear itself?
No. Unless it was caused by a one-time software glitch, the code will persist or return on the next cycle until the underlying overfill issue or faulty sensor is repaired.
How long does it take to repair this issue?
A qualified appliance technician can usually diagnose the root cause and replace a faulty inlet valve or water level sensor in 45 to 90 minutes.
Will it damage my dishwasher to keep running it with an OC code?
Yes. Ignoring an overfill error is highly risky. It can lead to a major kitchen flood, water damage to your cabinetry, and electrical shorts in the dishwasher's base components.
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