23Water TreatmentThis water heater is equipped with an optional automatic service reminder function to alert the userwhen ushing or a cartridge/lter change is required. Once activated, the unit will display an "05" errorcode on the remote controller when maintenance is due. The service interval can be set for either 6,12, or 24 months; refer to page 24 for recommended ushing intervals. If a water treatment device isinstalled, refer to the instructions provided with the device for suggested service intervals. By default,the service reminder function is disabled.To activate or adjust the service reminder error "05", refer to the below procedures.Note: The setting must be done within the rst 10 minutes of connecting electrical power to the waterheater.Setting Procedure:1. Turn the water heater off by pressing the Power On/Off Button on the remote controller.2. Disconnect, then reconnect electrical power to the water heater.3. Press Setting Button " " or " " within 10 minutes of connecting electrical power until the remotecontroller displays "99".4. Press Setting Button " " or " " until the remote controllerdisplays "2C".5. Press the Flow Meter Alarm Set Button for more than0.5 seconds to switch between ON and OFF."oF" PRIORITY LED goes out"on" PRIORITY LED blinks6. If "2D" also needs to be changed, repeat steps 4 and 5.7. To conrm the settings, press the Setting Buttons " " and " " simultaneously for more than5 seconds. After the settings are conrmed, the maintenance writer mode will end and the remotecontroller display will disappear.ON= OFF=No warning2D 2C6 months12 months24 months*Initial factory setting.Reset the display of the operation panel in the following way after the water heater is serviced.When the "05" error code appears, reset the display only after the water heater is ushed and/orthe water treatment device is serviced.If the error is reset without performing the necessary service, the water heater may fail prematurely.Note : In the case of Quick connect multi system, perform scale cleaning of both units.1. Set the Power On/Off Button to the OFF position.2. Push the Flow Meter Alarm Set Button more than 2 seconds.3. Push the Flow Meter Alarm Set Button several times until "7 oF" is displayed.4. Press Setting Button "" more than 5 seconds.This will complete the service warning reset.5. Push the Power On/Off Button.6. The preset temperature is displayed.How to reset the scale warning:Press setting button "" more than5 seconds. At this time, a sound isemitted from the operation panel.Push the Power On/Off Button.Setting ButtonFlow MeterAlarm Set ButtonPower On/Off Button