My bunn ultra 2 slushy machine display say bad tic clock what does that mean?

check the link below

https://www.google.com/search?q=Bunn+bad+tic+clock+location&oq=Bunn+bad+tic+clock+location&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8

check with bunn i have no idea what is making it put out black

The Bunn Ultra-2 originally came with several circuit boards, including the main control board and a small memory board also known as the "TIC Clock". This little board, screwed in directly behind the main control board and has a small round metal circuit on it that looks like a watch battery, but it is not -- the metal "Can" contains the timing and memory functions for the main control board.
There is also a small battery inside the "can", which maintains the memory when power is removed from the machine. Over time, this battery will fail and you will see an error message on your LCD readout that says ":Bad TIC Clock". In the past you could just buy a new TIC Board from Bunn and install it and you'd be back on your way again. But, Bunn no longer sells the TIC Board and instead Bunn wants you to purchase a new Main Circuit Board that has the memory and timing functions built right on the new Main Board. The list price is over $200.
You can now purchase a TIC Board Rehabilitation kit from the Margarita Guys for under $50 which will replace the failed circuitry on the small TIC Board. Go to ebay and search "Bunn TIC Board" and you will see the kit available there. It includes all the necessary tools, 9 pages of detailed instructions and annotated photos, free Priority Shipping, and free phone access to their Bunn trained and certified Journeyman Technicians for any help you may need.
This should be the perfect answer to resolve your Bad TIC Clock message and the working errors that come with it.

Make sure it's on ice, not chill or off. clean the rear filter and make sure there is at least 6 inches of space behind the machine for it to breathe.

make sure both say "ICE" on the display. press the snowflake buttons on the front to get it there. also, make sure you are mixing the product properly. if still an issue, you may have a small refrigeration leak that should be looked at by a professional

clean the filter and condenser coils, leave at least 6 inches of space for it to breathe

remove the bowls by pushing in black button on the bottom front left of the bowl, pull the bowl up a little, then pull it forward and off. pull the auger off and the seal is opaque, cup shaped, and on the shaft. replace that, lube the edge with food safe lubricant (i.e. superlube), lube the large round bowl seal in the back and put it all back together. you may need a preventive maintenance kit installed as well, but that's a bit more involved

Check the filter in the back of the machine that and the coils are covered with dust.

Check under the commercial products link on bunn.com to download a copy of the manual.