Where is the serial number on a AEG dishwasher?

Open the door and look at its inner corner, on the edge. The data plate carries the PNC and serial number.

Where the rating plate is1
  1. On the edge of the door: open it to see

Source: AEG UK – Where can I find appliance's PNC number?

How old is my AEG dishwasher?

Copy the serial number from the plate, or paste everything on it.

AEG

All AEG appliances