AEG Washer Error Code E40

E40 on an AEG washer indicates the machine cannot confirm the door is closed and locked. The fault points to one of three components: the door lock assembly, the ribbon cable connecting it to the control board, or the main electronics board itself. The washer will refuse to run while this code is active as a built-in safety measure.

No, you should not attempt to force the washer to run with an E40 error active. The machine is designed to prevent operation when the door lock cannot be confirmed, and bypassing this would risk the door opening during a cycle. Resolve the fault before using the appliance.

Repair costs vary depending on which component has failed. A replacement door lock assembly typically runs in the range of $30 to $80 for the part alone. A new main control board is the most expensive scenario, often ranging from $100 to $250 or more for the part. Adding professional labor will increase the total cost depending on your location and the technician's rates.

A knowledgeable DIYer can often resolve E40 by replacing the door lock assembly, which is the most common cause. You should also check that the ribbon cable is undamaged and fully connected at both ends before ordering parts. If the lock and cable are both in good condition, the main control board may need replacement, which is a more involved repair.

A power reset may temporarily clear the code, but E40 will return if the underlying fault is not repaired. If the door lock assembly, ribbon cable, or control board has a physical defect, no amount of resetting will resolve the problem. The faulty component must be diagnosed and replaced.