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Technical Literature Department 27 of 52 Ashland City, TN © 2008
Servicing should only be performed by a Qualified Service Agent
ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
UIM
The UIM (User Interface Module) is the display on the front of the water heater. The UIM’s
major components include a Circuit Board with LCD display and a Button Pad Overlay which
contains the five user input buttons.
Service Notes - Button Pad Ribbon Cable
The Ribbon Cable that connects the Button Pad Overlay to the UIM Circuit Board must be
plugged in exactly as shown in the images below; with the metal crimp connections visible
on the plug end and the UIM Circuit Board back facing out. There are six pins on this Ribbon
cable socket, Ensure all six pins are inserted into the Ribbon Cable plug whenever removing
or installing the UIM or Button Pad Overlay.
Failure to connect this Ribbon cable exactly as shown when servicing will render the User
Input Buttons inoperable. This should be checked whenever the nature of the service
complaint is an inoperable or unresponsive controller or UIM.
Button Pad Overlay
J2 Socket - CCB
Communication
UIM Circuit Board Back
J3 Socket - Button Pad
Communication
Ribbon Cable To
Button Pad
Ensure Ribbon Cable Plug
is inserted exactly as shown.
UIM Circuit Board Front
LCD
Screen