Worst case scenario right? We attempt to avoid this situation by having our BioMedical department thoroughly test and inspect every machine before it leaves our corporate headquarters. Unfortunately, things do happen sometimes. If it does, first reread the instructional manual that came with the equipment and verify correct setup and use. If this won't correct the issue, call one of our Patient Care Representatives at 1-877-301-4276 and they will walk you through some trouble shooting measures. If the problem persists, we will replace the machine ASAP.