DeLonghi Magnifica: no water coming through

Hi everyone,

I got a DeLonghi Magnifica 2 months ago, used it for about 1 week, then emptied and cleaned the tray and left the machine for 6 weeks or so.

When I turn on the machine now, there is never any water coming through, neither upon start-up nor when I press a button. Instead, the water light starts blinking (the reservoir is full). According to the instructions, this indicates too fine a grind. I initially thought the grinder needs to be cleaned, but the machine does push ground coffee through into the tray whenever I press the button, and there is no water when I turn the machine on either, so it seems water-related to me.

Does anyone know what this could be? I thought I might need to descale the machine, but it seems like there is a separate light to indicate that, and since I only had the machine for 2 months and used it for only 1 week, that seems unlikely to me.

Thanks!