Samsung Dishwasher OC Error: Overflow Detected

The OC error code on Samsung dishwashers is a critical alert indicating there is more water in the dishwasher than there should be. This error requires immediate action to prevent water damage and potential electrical hazards.

What the OC Error Code Means

When your Samsung dishwasher displays OC (or 0C, oE on some models), the water level sensor has detected that:

• Water levels exceed safe operating parameters, OR
• Water is accumulating faster than it can drain, OR
• The float switch has been triggered by excess water

This is one of the few errors that requires immediate intervention—not just troubleshooting at your convenience.

Model Coverage

This guide applies to Samsung dishwashers displaying OC, 0C, or oE error codes:

• DW80CG, DW80BB, DW80B series (2022+)
• DW80R, DW80T series (2019-2022)
• DW80M, DW80K, DW80J, DW80N series (2015-2020)

Immediate Action Required

Before any troubleshooting, complete these steps:

1. Turn off the water supply valve under the sink (turn clockwise)
2. Turn off the circuit breaker for the dishwasher
3. Place towels around the base to catch any overflow

Only proceed with diagnosis after water supply and power are disconnected.

Common Causes

The OC error typically results from:

1. Drain hose backflow—no high loop or air gap installed
2. Same drainage blockages that cause 5C/5E errors
3. Water inlet valve stuck open—won’t close when commanded
4. Excess detergent creating suds interpreted as high water level
5. Failed water level sensor giving false readings

Step-by-Step Fix

Step 1: Remove Standing Water

With power and water off, remove excess water from the dishwasher.

1. Open the dishwasher door carefully—water may be at the door seal level
2. Use towels to absorb water from the tub bottom
3. Remove the kick plate (bottom front panel)
4. Check the base pan for standing water
5. Use a wet/dry vacuum or towels to remove base pan water

Step 2: Check Drain Hose Installation

Improper drain hose installation is the most common cause of OC errors.

1. Open the cabinet under the sink
2. Locate the dishwasher drain hose
3. Verify it has a high loop—the hose should rise to a point under the countertop before descending to the drain connection
4. The high loop prevents dirty water from the sink drain from flowing back into the dishwasher
5. If no high loop exists:
   • Secure the hose at its highest practical point using a hose clamp or zip tie
   • The loop should be above the drain connection point

Step 3: Clear Drainage Blockages

The same issues that cause 5C/5E drainage errors can lead to OC overflow errors.

1. Run the garbage disposal for 30 seconds (restore power briefly if needed)
2. Clean the drain filter at the bottom of the dishwasher tub
3. Check for kinked drain hose sections
4. Verify the garbage disposal knockout plug is removed (new installations)

Step 4: Test for Stuck Inlet Valve

A stuck-open inlet valve allows water to continuously enter, causing overflow.

1. Keep the water supply OFF
2. Temporarily restore power at the breaker
3. Turn on the dishwasher but don’t start a cycle
4. Listen carefully at the inlet valve area (where supply hose connects)
5. If you hear water trickling or flowing with the supply valve closed, the inlet valve may be leaking internally
6. If water flows when you briefly open the supply valve (even with no cycle running), the inlet valve is stuck open

If the inlet valve is stuck open: Turn off water supply immediately and call for service. A stuck inlet valve requires replacement.

Step 5: Check for Detergent Issues

Excess detergent can create suds that the water level sensor misinterprets as overflow.

1. Check detergent type—use only dishwasher-specific detergent
2. Verify you’re using the correct amount (check dispenser markings)
3. If suds are visible, run several rinse cycles after cleaning the tub
4. Consider switching to a low-sudsing dishwasher detergent

Step 6: Test the Water Level Sensor

If drainage is clear and inlet valve is functioning properly, the water level sensor may be faulty.

1. With the dishwasher empty and dry, restore power
2. Start a normal cycle and observe the fill
3. The dishwasher should stop filling after 2-4 minutes
4. If it continues filling indefinitely, the water level sensor or control board may be faulty

Professional service required if the sensor or control board is suspected.

Step 7: Restore and Test

After addressing identified issues:

1. Ensure the base pan is dry
2. Restore water supply (open valve counterclockwise)
3. Restore power at breaker
4. Run a short cycle and monitor closely for:
   • Proper fill levels
   • Normal drainage
   • OC error return

Safety Warnings

• Never ignore an OC error—overflow can cause water damage and electrical hazards
• Always disconnect power before touching internal components with standing water
• Turn off water supply first to prevent continuous flooding
• Don’t use the dishwasher until the cause is identified and resolved
• Check for water damage to flooring and adjacent cabinets after an OC event

When to Call a Tech

Contact a professional immediately if:

• Water continues entering with the supply valve closed (internal valve leak)
• The inlet valve is stuck open
• OC errors return after addressing drainage issues
• The water level sensor appears faulty
• You notice water damage to surrounding areas

Typical repair costs:

• Inlet valve replacement: $100-175
• Water level sensor replacement: $125-200
• Control board issues: $200-350

Sources

For official Samsung support:

• Samsung Dishwasher Error Codes
• Samsung US Support

Related Guides

• Samsung Dishwasher Error Codes: Complete Guide
• Samsung Dishwasher 5C/5E Error: Drainage Fix
• Samsung Dishwasher LC/LE Error: Leak Sensor Fix