dude, just hook up the flush cart, it only takes a few minutes....
but i think the brother needs a di bottle hooked to it also, or just put
bottled water in the system, to ensure it is clean(don't use tap water)
if you don't put water in the system, the brother may alarm...(not sure)
however the machine should boot to an input screen even without water,
then maybe you can jog.....
the brother expert is craig at edmnetwork
go to edmnetwork.com
sorry i can't remember all the nuances of the brother as i don't work on very many...