How? It's broken.
LOL I know for a fact when the "ice cream machine doesn't work" it either ran out of 'milk'... cuz refilling requires pouring a 2 gal bag of sugary milk into the top end the chances of spilling and making a massive mess are pretty high.
Or they didn't do cleaning cycle and it's won't turn on until they do.
Go to Diary Queef if you want ice cream.