SERVICE HANDBOOK

UIM (CONT)ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUALDesktop ScreenThe Desktop screen is the default screen. If there are no active fault messages the displaywill return to this screen with no user input after approximately 10 minutes. The Desktopscreen displays text and icons that provide operational and diagnostic information.The first line of text on the Desktop screen is the temperature of the water inside the tank.Tank Temperature data will only be visible on commercial models.The second line of text on the Desktop screen is the Operating Set Point. The OperatingSet Point is a user setting that can be adjusted in the Temperatures Menu. The OperatingSet Point is the temperature at which the water heater will maintain the water inside the tank.The third line of text on the Desktop screen shows the current Status of the control system.The current Operational State of the water heater’s control system is displayed in real time.Operational States are explained on page 31.CONTROL SYSTEM DESKTOP SCREENDiscreet Menu - Contact InformationWhile viewing the Desktop screen(left). Press and hold down the middleOperational button for 30 secondsthen release it. This will launch adiscreet menu that contains aprovision for adding personalizedcontact information that will bedisplayed on all fault messagescreens. The installing contractor orservice agent can enter theircompany name and phone number tohelp the home or business ownercontact them for service.Note: Tank Temperature will only be visible on commercial models.Service Note - Sequence of Operation DisplayThe Desktop screen displays the Sequence of Operation in real time using animated “StatusIcons.” This is valuable information when servicing the water heater that can help correctlydiagnose service problems more quickly.Review the Sequence of Operation on page 40 and the Status Icons explanation in Table 4on page 30. Learn to use this visual display of the Sequence of Operation whentroubleshooting the water heater. IE: if the Igniter Status Icon comes on but the Check MarkStatus Icon does not appear next to it within 5 seconds the control system has not sensedminimum igniter current of 2.0 AC amps.Technical Literature Department 29 of 52 Ashland City, TN © 2008Servicing should only be performed by a Qualified Service Agent