Samsung Dishwasher 4C Error Code: How to Fix It

If your Samsung dishwasher displays the 4C error code, it usually means there is a water supply issue. The dishwasher is not getting enough water or is taking too long to fill the tub. As a safety measure, the cycle stops to prevent damage or improper washing performance.

This guide will help you understand the Samsung 4C error code and how to fix it step by step.

The Samsung Dishwasher 4C Error Code: Meaning, Causes, and Solutions

In the context of “4C” or “4E,” it stands for “Water Supply Error.” This error is triggered when the dishwasher fails to reach the required water level within 60 seconds after water is initially supplied or when the flowmeter detects fewer than 10 water supply pulses within 20 seconds after water is supplied during either the wash or rinse cycle.

What’s Causing the 4C on Your Samsung Dishwasher?

The most common causes include a closed water tap, low water pressure, a kinked inlet hose, a clogged inlet filter, or a faulty water inlet valve. In some cases, temporary pressure drops in the home water supply can also trigger this error.

1. Closed Water Tap or Low Water Supply Pressure: If the water tap is closed or the water supply pressure is lower than the recommended specifications, your dishwasher may not receive an adequate water supply, leading to the 4C or 4E error.
2. Partially Opened Water Faucet: When the water faucet isn’t fully opened, it restricts the flow of water into the dishwasher, leading to the 4C code.
3. Kinked Water Hose During Installation: A kinked water hose impedes the water’s path to the dishwasher, much like a garden hose that’s twisted and constricted. It prevents the necessary water flow, leading to the 4C and 4E errors.
4. Frozen or Ice-Covered Water Supply Valve: In cold weather, the water supply valve can freeze or become encased in ice; this impediment affects the flow of water to your dishwasher.
5. Blocked Filter at the Water Valve: A clogged filter at the water valve can obstruct water flow. A clogged filter can limit water flow, leading to the 4C code or 4E error. In this case, the filter needs cleaning or replacement.
6. Faulty Wiring Harness: A faulty wiring harness between the main board and critical components like the water inlet valve, flowmeter, or pressure sensor can disrupt communication.
7. Faulty Water Inlet Valve: The water inlet valve controls the flow of water into the dishwasher. If it’s malfunctioning or doesn’t open as it should, the dishwasher won’t receive the necessary water supply.
8. Faulty Flowmeter: The flowmeter is responsible for measuring water flow. If it’s not functioning properly, it can’t provide accurate information to the dishwasher. A malfunctioning flowmeter can’t accurately gauge water intake, leading to a 4C error.
9. Faulty Main Board: The main board serves as the dishwasher’s brain, coordinating all functions. If it’s malfunctioning, it can’t effectively manage the water supply and other operations, leading to the 4C fault code.

Fixing the Samsung Dishwasher 4C Error code: Comprehensive Troubleshooting and Solutions

If you encounter the 4C fault code on your dishwasher, follow these troubleshooting steps to resolve the issue:

1. Check the water pressure and valve
   • Ensure that the water supply pressure is not too low and that the water supply valve leading to your dishwasher is fully open.
   • Verify that the water pressure meets the recommended specifications, which should be within the range of 40–90 psi.
2. Kinked water hose
   • Inspect the water supply hose to ensure it is not kinked or bent. If you find any kinks, carefully unkink the water inlet hose.
3. Flood-Safe Water Supply Line
   • If you have a flood-safe water supply line installed, be aware that it can sometimes shut off the water supply even in the absence of a leak. Consider replacing it with a standard water supply line.
4. Check for foreign material
   • Examine the water supply line and the water valve filter for any foreign material or debris. If found, clean or remove it to ensure a clear water path.
5. Water Valve Connection
   • Check that the connector to the water valve is securely inserted. Re-connect it if necessary.
6. Water Inlet Valve Resistance Measurement
   • Remove the connector from the water valve and measure its resistance. The normal range should fall between 0.89 and 1.09 KΩ.

7. Flow Meter Main Voltage Measurement
   • Measure the DC main voltage supplied to the flow meter between the red and black wires. The normal range should be between ~ 4.98 and 5 VDC. If the flow meter is not receiving +5 volts, consider replacing the main board.

8. Flow Meter Feedback Voltage Measurement
   • When the inlet valve is energized or when water flows through the flowmeter turbine between the white and black wires, measure the DC feedback voltage supplied from the flow meter to the main board. The normal range is ~2.5 Vdc. If the flowmeter is not sending +2.5 Vdc to the main board, replace the flowmeter assembly.

9. Pressure Sensor Checking
   • Check the pressure sensor for any issues, and replace it if necessary.

10. Main Board Replacement
    • If all the above troubleshooting steps fail to resolve the Samsung dishwasher 4C error code and the issue persists, it may be necessary to replace the main board of the dishwasher.

Final Thoughts

The Samsung Dishwasher 4C error code is mainly related to a water supply problem, and in most cases, it can be fixed by checking the tap, hose, and inlet filter. If the issue continues after basic troubleshooting, the water inlet valve or control board may require further inspection.

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