AEG Washer Error Code CD

The CD error code on an AEG washer indicates a fault within the door locking system. This code is triggered when the control electronics detect an abnormal signal from the door lock assembly, also called the door interlock. The door lock is a safety-critical component that must confirm a secure latch before the machine will begin or continue a wash cycle. When the control board cannot verify a proper lock signal, it halts operation and displays CD to alert the user and technician.

There are three primary fault paths associated with this code. First, the door lock mechanism itself may have failed internally, either through a burned-out solenoid, a broken bimetal element, or a faulty micro-switch that reports lock status back to the control board. Second, the wiring harness connecting the door lock to the main PCB may be damaged, corroded, or have a loose connector, preventing the signal from reaching the electronics correctly. Third, the main control board or secondary electronics may have developed a fault causing it to misread or fail to process the door lock signal entirely.

Diagnosing CD requires a systematic approach starting at the door lock assembly. Inspect the wiring harness for visible damage, corrosion, or disconnected terminals before condemning any component. If the wiring checks out, the door lock should be tested for correct operation and continuity. If both the lock and wiring pass inspection, attention should turn to the control electronics. Replacement of the door lock is the most common resolution, followed by cable repair or replacement, and then main board replacement as a last resort.