SERVICE HANDBOOK

UIMULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUALThe UIM (User Interface Module) is the display on the front of the water heater. The UIM’smajor components include a Circuit Board with LCD display and a Button Pad Overlay whichcontains the five user input buttons.Service Notes - Button Pad Ribbon CableThe Ribbon Cable that connects the Button Pad Overlay to the UIM Circuit Board must beplugged in exactly as shown in the images below; with the metal crimp connections visibleon the plug end and the UIM Circuit Board back facing out. There are six pins on this Ribboncable socket, Ensure all six pins are inserted into the Ribbon Cable plug whenever removingor installing the UIM or Button Pad Overlay.Failure to connect this Ribbon cable exactly as shown when servicing will render the UserInput Buttons inoperable. This should be checked whenever the nature of the servicecomplaint is an inoperable or unresponsive controller or UIM.Button Pad OverlayUIM Circuit Board BackJ2 Socket - CCBCommunicationJ3 Socket - Button PadCommunicationEnsure Ribbon Cable Plugis inserted exactly as shown.Ribbon Cable ToButton PadLCDScreenUIM Circuit Board FrontTechnical Literature Department 27 of 52 Ashland City, TN © 2008Servicing should only be performed by a Qualified Service Agent