my new slow cooker boiles everything. Can it be adjusted/fixed?
Return it to the store you bought it from. At most a slow cooker should simmer and definitely not boil. Also consider the maker, there are a lot of cheapola cookers out there.
check out the brands website for troubleshooting. that's not normal. i use the slow cooker often in the winter and for stock/broth year-round. is there only one setting? no high/low? what are you cooking? agree, that it may have to be returned or dumped for safety. is it a new slow cooker?