FIlters not sucking?

Hi there,
New to the hot tub world,
I have a odyssey 780 which I now own due to buying a new house with it.
When i got the house, everything seemed to work good, I got all the chemicals in , cleaned the filters,
but now I have dirt in bottom of hot tub and filters dont seem to be sucking in anything or doing their job, ive been playing with control panel and not sure if I turned something off or what,
Ive been playing with the purge cycles and turned them up but hasnt clean the hot tub at all,
Anything will help,
Thanks