194.3 TroubleshootingThe following procedures instruct how to locate, evaluate, and fix a problem when WaterGuard issues analarm or indicates suspect chemical levels.4.4 Replacing ComponentsThe following procedures describe how to replace certain WaterGuard components.Caution: The following procedures should only be performed by properly qualified and trainedWaterGuard analyzer technicians.Warning: Disconnect all power supplies to the WaterGuard analyzer before opening the control unit door.Replacing any parts of WaterGuard without the expressed written authorization of Chemical InjectionTechnologies, Inc., or the qualified representative who supplied the product may void the warranty.Chemical Injection Technologies, Inc., takes no responsibility, written or implied, for installation ormaintenance of WaterGuard that is not performed by a properly trained and certified WaterGuardtechnician.