Error Code C3

The C3 error code on your AEG, Electrolux, Quelle, or Privileg dishwasher signifies that the anti-flood protection system (often called Aqua-Control or Aqua-Stop) has been activated. This crucial safety feature means that the dishwasher has detected water leaking into the appliance base (drip tray) and has stopped all operations to prevent damage and flooding.

The machine will remain locked in the C3 error state until the water is removed from the base pan and the source of the leak is identified and resolved.

Meaning of Dishwasher Error Code C3

The C3 error code is not a sensor failure but rather a confirmation that the water sensor (a float switch typically mounted on a polystyrene float) in the lower drip pan has risen due to the presence of leaked water. When the float rises, it trips a microswitch, immediately shutting down the water inlet valve and activating the drain pump (if applicable) to prevent further flooding.

In short, C3 means: Water Leak Detected in the Base Pan.

Possible Causes of C3 Leak Detection

Troubleshooting the C3 error involves tracing the path of the water that triggered the flood sensor. Common points of failure include:

• Damaged or Loose Inlet/Drain Hoses: The connection points where the fill hose or drain hose attach to the appliance, or cracks anywhere along the hose length, can cause external leaks.
• Worn or Damaged Door Gasket: Over time, the rubber door seal can become brittle, cracked, or dirty, leading to leaks, especially in the bottom corners of the door when the spray arms are active.
• Internal Component Leakage: Seals around major components often fail. This includes the seals on the circulation pump, the drain pump, or the heat element housing.
• Sump/Tub Assembly Cracks: In rare cases, physical damage or stress can cause a micro-crack in the plastic sump or the main wash tub itself.
• Defective Water Inlet Valve (Less Common): If the inlet valve fails to close completely, it can cause the machine to slowly overfill, eventually triggering the pressure switch or, in extreme cases, overflowing into the base pan.
• Faulty Float Switch: While the error is usually caused by water, the plastic float may be physically stuck in the “up” position, or the microswitch it controls may be defective, falsely signaling a leak.

Step-by-Step Troubleshooting Guide for Error C3

Safety first: Always unplug the appliance from the electrical outlet before performing any inspection or repair work.

1. Drain the Base Pan: The machine will not reset until the water is cleared. Carefully tilt the dishwasher forward about 45 degrees. Gravity will cause the accumulated water in the base pan to spill out onto the floor. Place towels down first. Repeat this process until no more water drains out.
2. Plug In and Test Reset: Plug the machine back in. If the C3 error clears immediately, the problem was temporary, and you can proceed to Step 3. If C3 reappears immediately, the float switch is either stuck or defective (proceed to Step 6).
3. Inspect Hoses and Connections: Visually check the main inlet water hose (Aqua-Stop hose) and the drain hose for visible damage. Ensure their connections to the home plumbing and the dishwasher itself are tight and leak-free.
4. Examine the Door Seal: Open the door and carefully inspect the entire rubber gasket/seal that lines the edge of the tub. Look for tears, nicks, or accumulated debris. Clean the seal thoroughly and ensure it is seating correctly when the door is closed.
5. Run a Quick Diagnostic Cycle (Observation): If the error cleared after draining, start a short, empty rinse cycle. Immediately listen and look underneath the machine (if safe and accessible, or by carefully removing the toe kick panel) to try and identify the origin of the leak while the machine is filling or circulating water. Look for dripping near the pumps.
6. Check the Flood Sensor (Float Switch): If you are comfortable accessing the base (often requiring the removal of side or bottom panels), locate the float switch (usually a small plastic or foam piece). Ensure it moves freely and is not obstructed by debris. Clean it gently if necessary.

When to Call a Professional Technician

If you have drained the base pan, confirmed the exterior hoses are sound, and the C3 error returns immediately or upon the start of the next wash cycle, the leak source is internal and requires more complex disassembly.

You should contact a certified appliance technician if:

• The leak originates from the circulation pump seal or drain pump connection, which requires component replacement.
• The water inlet valve or pressure chamber needs to be replaced.
• You cannot locate the source of the leak, or the troubleshooting requires lifting and maneuvering heavy components (like the main motor/pump assembly).
• The float switch or its associated microswitch needs internal wiring inspection or replacement.