If you’re handy, you can take the machine apart to diagnose the issue. As far as clogs go, they’re often the product of broken gumballs stuck in the tube. To prevent malfunctions like these, it’s a good idea to clean out your gumball machine periodically, especially since there’s the potential of sugar build-up that may affect internal components. If the issue is more complex, you can contact the machine’s manufacturer for further details regarding repair or replacement.