Electrolux Washer Error Code ED4

The ED4 error code on an Electrolux washer-dryer indicates a fault in the relay responsible for commutating (switching) power between the washing heating element and the drying heating element on the WD board. In washer-dryer combination units, a dedicated relay controls which heating element receives power depending on the current cycle phase. When this relay fails to operate correctly, the control system detects the fault and triggers the ED4 code to prevent potential overheating, incorrect operation, or component damage.

The fault can originate from three primary areas: the wiring harness connecting the relay circuit, the WD board itself (which houses the commutating relay), or the main PCB that sends control signals to the WD board. A wiring fault could include a broken connector, corroded terminal, or a wire with damaged insulation causing an open or short circuit in the relay control path. If the wiring checks out, the WD board relay may have failed internally due to contact wear, overload, or heat stress.

Diagnosis should begin with a thorough visual and continuity inspection of all wiring between the PCB and the WD board, paying close attention to connectors and terminals in the relay circuit. If wiring is intact, the WD board should be examined for signs of burning, cracked solder joints, or a visibly damaged relay. If both the wiring and WD board appear serviceable, the main PCB may be sending incorrect signals or failing to drive the relay, and further testing or replacement of the PCB may be necessary.