Automatic Litterbox Central

Hi. My litterfree broke about a month ago - Er 1, fills too high and gets water on the floor, won't slosh.

I tried to buy a replacement on ebay, and got ripped off, stuck with a demo model that fills and unfills but won't slosh.

Is there anyway I can combine these into one working litter free? (I'd rather use the cleaner, "newer" demo as the base.) Anyway to tell the demo to start acting like the real thing?

I'm incredibly frustrated.

Maybe its broken and not a demo - when it should start churning, the screen goes blank for a second, and it sort of humms for what would be the time to churn...

Remove the processing unit from the box, and turn it over - if it's not a demo unit, you should see a fairly large propeller. That propeller should turn by hand unless something has jammed it.