A crock pot doesn't really boil anything including pasta and making pasta in a crock pot is not really the best way of cooking pasta as it can become mushy.
I would recommend just using a pot and stove to to boil the pasta as it does much better at cooking the pasta.
The pasta will come out much better in the pot on a stove than it would in a crock pot or slow cooker.
I've tried cooking pasta in a crock pot but it usually became mushy and wasn't as good as it would be cooking it in the crock pot.
The pasta will will cook on the stove within 12 minutes but can take around 30 minutes to cook in the crock pot.