EDC warning light on MAN LE150C (D 0824 LFL engine)

Long shot - I spent FAR too long on this exact problem once, and in the end it was simply that one of the bulbs was not the correct bulb, and the flasher unit was not detecting the correct load and not flashing the dash light.

I finally tumbled to this when something made me try swapping the right bulbs with the left bulbs and the problem shifted to the left side.