Error Code CU

Error Code CU - Dishwasher Troubleshooting Guide

Error Code: CU

Appliance Type: Dishwasher

Applicable Brands: AEG, Electrolux, Quelle-Privileg

The appearance of the Error Code CU on your AEG, Electrolux, or Quelle-Privileg dishwasher indicates a specific issue related to water distribution within the appliance cavity.

Meaning of Error Code CU: This specific diagnostic code signifies that the dishwasher system has detected an operational anomaly consistent with a blocked or restricted spray arm. The spray arms are crucial components responsible for rotating and forcefully projecting water jets onto the dishes to achieve effective cleaning. If circulation is impaired, cleaning performance will suffer, and the error code will be displayed.

Troubleshooting Steps and Resolution:

To resolve the Error Code CU, you must thoroughly inspect and clear any obstructions affecting the movement or water output of the spray arms:

1. Inspect the Upper Spray Arm:

   • Carefully pull out the upper rack of the dishwasher.
   • Locate the upper spray arm (often attached beneath the top heating element or spray arm mount).
   • Gently attempt to rotate this arm by hand. It should spin freely and without resistance. If it catches on taller items loaded onto the top rack (such as tall glasses or serving spoons), reposition the items immediately.
   • Examine the small outlet holes (nozzles) along the arm. Use a thin, non-metallic object, such as a toothpick or a straightened paper clip (use caution not to enlarge the holes), to gently probe and clear any visible debris, food particles, or limescale buildup that might be impeding the water flow from the jets.

2. Inspect the Lower Spray Arm:

   • Remove the lower dish rack completely to gain clear access to the lower spray arm assembly, which usually rests over the lower heating element area.
   • Test the rotation of the lower spray arm. It must spin unimpeded. Obstructions here are often caused by large items like serving platters, pot handles, or foreign objects that have dropped to the bottom of the tub.
   • Similar to the upper arm, inspect all the directional spray nozzles. Systematically clear any lodged debris from these small openings to ensure a full, consistent spray pattern when the machine operates.

3. Inspect the Spray Arm Mounting/Attachment:

   • Confirm that both the upper and lower spray arms are securely seated on their respective mounting posts. A loose spray arm can dislodge during the wash cycle, causing it to strike the racks or internal components, leading to binding or failure to rotate correctly. Ensure any retaining nuts or clips are properly fastened according to your model’s configuration.

Restoring Normal Operation: Once you have thoroughly checked both spray arms, cleared any blockages found in the nozzles or underneath the arms themselves, and confirmed they can rotate smoothly, reinsert the racks. Initiate a short rinse cycle or run a standard wash program. If the blockage was the sole cause, the error code should clear, and water will once again circulate freely and forcefully, ensuring your dishes are cleaned effectively.