Where is the Water Level Sensor AEG 55002vi?

Hi,

Our dishwasher is bringing up the i30 error (anti-flood) drainage message. The pump goes continuously despite no water in the tray and no blockage that we can locate.
We have managed to get it working for one full cycle, and then the pump starts again. I suspect the water level sensor has a fault / is getting stuck on intermittently and therefore my question is - where is the water level sensor (presumably above the tray underneath the machine) and what does it look like? We have been under the machine and had it out / tipped it up etc and like I said - no water at all. If anyone has a picture of said sensor to make location simpler, it would be massively appreciated! Many thanks, Voirrey