Nuera air 50 central vac trouble shooting

Hi all,

I can't figure out how to get this vac running again. I emptied the container, washed the bag, pressed 2 buttons - held for 10 seconds each, unplugged/replugged it. The status light keeps flashing green. The manual says to reset it by pressing the "reset" button (where is that?) for 5 seconds. Any help would be most appreciated!

PS - I googled Nuera, and this vac seems to be sold under various brand names. Air 50 is consistent.