12Customer Service Troubleshooting Tips Care and Cleaning Operating Instructions Installation Instructions Safety InstructionsSafety PrecautionsDo turn off power to water heaterif it has been subjected to overheating, fire, flood, physicaldamage.Do Not turn on water heaterunless it is filled with water.Do Not turn on water heater ifcold water supply shut-off valve isclosed.If there is any difficulty inunderstanding or following theOperating Instructions or theCare and Cleaning section, it isrecommended that a qualified personor serviceman perform the work.Operating the water heater.CAUTION: Hydrogen gas can be produced in a hot water system served by this water heater that has not beenused for a long period of time (generally two weeks or more). HYDROGEN GAS IS EXTREMELY FLAMMABLE!! Todissipate such gas and to reduce risk of injury, it is recommended that the hot water faucet be opened for severalminutes at the kitchen sink before using any electrical appliance connected to the hot water system. If hydrogenis present, there will be an unusual sound such as air escaping through the pipe as the water begins to flow. Donot smoke or use an open flame near the faucet at the time it is open.CAUTION: The causeof the high temperaturecondition must beinvestigated by qualifiedservice technician andcorrective action mustbe taken before placing thewater heater inservice again.Safety ControlsThe water heater is equipped with acombination thermostat and temperaturelimiting control (ECO) that is locatedabove the heating element in contactwith the tank surface. If for any reasonthe water temperature becomesexcessively high, the temperaturelimiting control (ECO) breaks the powercircuit to the heating element. Once thecontrol opens, it must be reset manually.To reset the temperature limitingcontrol:Turn off the power to the waterheater.Remove the jacket access panel(s)and insulation.The thermostat protective covershould not be removed.Press the red RESET button.Replace the insulation and jacketaccess panel(s) before turning onthe power to the water heater.Emergency InstructionsWARNING: If the water heater hasbeen subjected to flood, fire, orphysical damage, turn off power andwater to the water heater.Do not operate the water heater againuntil it has been thoroughly checked byqualified service personnel.