Check that the whipper head has been properly cleaned. Follow the cleaning instructions given in the accompanying whipper instructions. If you add other ingredients to the cream, ensure that these are dissolved or stirred in. Otherwise clumps may form, blocking the dispensing system. A blocked dispensing system may cause leaks.
You should only use iSi original components. The individual components of iSi Whippers are tailored to work perfectly together. Never combine your iSi Whipper parts with those from other manufacturers as we cannot provide a guarantee for them. iSi heads are marked on the head and charger holder. iSi bottles are marked on the base.